Multiverse

[CraftyChara]

Character(s) accidentally or on purpose go to Parallel Universe(s) maybe even meet their doppelganger(s)

Something like Fringe season 3 and 4. Or Sliders

I have already read The Subtle Knife

[MJ]

The Dark Age, series. Modern chick back in time. Repeated time travel involved. Same soul group reconnecting in different era's...

The Causal Enchantment Series

[CraftyChara]

Thanks for the suggestions! I'll be sure to add them to my To Read list!!

[Scott]

A Swiftly Tilting Planet
The Coming of the Quantum Cats
Finity

[CraftyChara]

I already read A Swiftly Tilting Planet, it was great. I'll add the other two to my to read list.

[Hillary]

The Boy Who Reversed Himself and
Singularity
William Sleator is one of my favorite tween/teen Science Fiction writers, I think both of these fit.

[MJ]

A Thousand Pieces of You
A Lady Out of Time
Lightning

Don't think it's what you're looking for, but James Patterson also has a story that has two different story lines. First book is just a duo. Second set is a series with the same characters as the first, from the same original situation, but whole new storyline. First books MA15+, second set are PG13.
When the Wind Blows & The Lake House
The Angel Experiment... series

[CraftyChara]

Thanks! I've added these to my to read list!

[Zak]

Thiers also fair coin but it srarts a bit slow

[CraftyChara]

Did you mean Fair Coin by E.C. Myers? If so, thank you. I added it to my list

[Ann aka Iftcan]

The Shadow of Albion 2 part series for this one. There was supposed to be a third book. which wrapped up an over-arcing mystery, but unfortunately, one of the authors died before it was written, so we are left to wonder--whodunit. . .

Dying Bites an FBI agent from our world gets pulled into a parallel world by magic from their side because they need someone with experience dealing/finding serial killers. Interesting idea.

A Connecticut Fashionista in King Arthur's Court this is a comic type series of 3 books.

Witch World This is actually the first book in a really BIG series that spans about 30 or so books. Not all of them deal with the same characters, nor do they all deal with people going to a parallel universe, but there are several characters that do have that happen to them. (This first book is one of the "does" ones.)

Quag Keep gamers wind up in their imagined gaming world--and before you say "done to death" this is, to my knowledge, the first time that idea was used in a book, since it was written back when the only "gaming" was done with paper and pen (think Dungeons and Dragons type games).

The Crossroads of Time 2 books series dealing with an entire culture that travels across worlds as a "normal" part of their civilization.

Ok, ya know--I'm going to just say, check out the works of Andre Norton since she used this idea a LOT. She has another 4 or 5 series/standalones where this happens.

Another Fine Myth humour lives in this series.

Charmed Life a series that deals with traveling to alternate/parallel worlds. This writer (Diana Wynne Jones) also has several series with this idea.

And the Devil Will Drag You Under standalone where the 2 MC's are bebopping around to different parallel worlds. Again, check out this author (Jack L. Chalker) since he has a couple of series with this idea.

[Peter]

The Fold by Peter Clines was pretty good.

Another "Gamers go into game" series is Joel Rosenberg's Guardians of The Flame. It starts with The Sleeping Dragon. I liked the series because it quickly became more than just escapist fantasy. The first book is about trying to get home to help some injured friends, but after that they stay in the fantasy world and try to improve it.

Lord Kalvan of Otherwhen is about a state trooper who is accidentally transported to an alternate world where a tyrannical religious order uses their monopoly on gunpowder to conquer and rule. He becomes quite popular with their current target when he reveals he knows the formula himself.

Them Bones by Howard Waldrop is both an alternate timeline and a time travel book. There are three storylines - an army scout who was part of a time travel mission to fix the past ends up in an alternate North America that Europe never invaded, the rest of his expedition ends up in the Mississippi River valley in the "regular" timeline, long before the Europeans arrived, and an archaeologist in 1930's Mississippi who is desperately trying to make sense of the evidence the second group leaves before the site is destroyed by a flood.

[CraftyChara]

Thank you.

[Ann aka Iftcan]

I'm going to agree with Peter about Joel Rosenberg. He does good work and has a well crafted story line.

[Deanne]

This might have been mentioned, but I didn't see it:
The Talisman

[CraftyChara]

No they did not mention How did I not know about this book? Stephen King is fantastic.

[Scott]

Ann aka Iftcan wrote: "I'm going to agree with Peter about Joel Rosenberg. He does good work and has a well crafted story line."

I'll third this suggestion--great series for the most part--and add Alan Dean Foster's Spellsinger series, about a rock musician who is transported to a reality where most nonhuman animals are sentient.

[CraftyChara]

Thanks sounds interesting.

[Deanne]

C wrote: "No they did not mentionHow did I not know about this book? Stephen King is fantastic."

Deanne wrote: "This might have been mentioned, but I didn't see it:
The Talisman"

Please give it a try! It has been years since I read it, but I remember pulling an all-nighter because I couldn't put it down.
In fact, it might be time to read it again....

[CraftyChara]

I have already placed a hold for it at my library.

[Ann aka Iftcan]

Split Infinity (first book in the Blue Adept series.) This series deals with 2 identical worlds that over-lap each other.

[CraftyChara]

Thank you.

[Ket]

Imajica.

[CraftyChara]

Thank you.

[CraftyChara]

Bump

[Peter]

One more that comes to mind is Wildside by Steven Gould. A high school senior finds a portal to another world where human beings never evolved. So there are no doppelgangers, but there's plenty of action and adventure on both sides of the portal.

[CraftyChara]

Peter wrote: "One more that comes to mind is Wildside by Steven Gould. A high school senior finds a portal to another world where human beings never evolved. So there are no doppelgangers, but the..."

Thank you. I do like parallel universe(s) with or without doppelgangers

[Ingo]

Kind of a spoiler, but Gingerbread Man: A Marlow and Sage Mystery Thriller (view spoiler)[is about a boy and girl dating online, but on different earths. Which the reader and one of the MC's only realize mid-book or so. (hide spoiler)]
Not too bad, but also no must-read, take it if you get it cheap or free, as I did.
My 3 star review, might put you off, and that's ok with me.

Also with parallels worlds:
The Corridor and The Thirteenth World.

[CraftyChara]

Ingo wrote: "Kind of a spoiler, but Gingerbread Man: A Marlow and Sage Mystery Thriller [spoilers removed]
Not too bad, bu..."

Thank you

[Courtney]

[CraftyChara]

Courtney wrote: ""

Thank you. It sounds very good.

[Bruce]

Try the Northwest Passage series

[CraftyChara]

Bruce wrote: "
Try the Northwest Passage series"

Thank you...though it's more of a time travel book instead of a parallel universe. But I also love time travel books.

[CraftyChara]

Ajk77 wrote: "Terry Pratchett and Stephen Baxter: the Long Earth series

Greg Bear: Eon/Eternity"

Thank you

[Bruce]

The Crosstime Engineer series if you like Polish jokes

[CraftyChara]

Bruce wrote: "The Crosstime Engineer series if you like Polish jokes"

Thank you.

[Empress]

Dark Matter - Very quick read, a lot of parallel universes and yes, other versions of the MC.

[CraftyChara]

Ellie [The Empress] wrote: "Dark Matter - Very quick read, a lot of parallel universes and yes, other versions of the MC."

Already placed a hold for it at my library. Thank you.

[CraftyChara]

Bump*

[Sarah]

Virtual Mode by Piers Anthony

[CraftyChara]

Sarah wrote: "Virtual Mode by Piers Anthony"

Thank you.

[Rosa]

Through the Medicine Cabinet
All the Zack Files books are hilarious. Probably too young for you, but otherwise just what you're looking for.

[Justin]

I just finished Dark Matter by Blake Crouch and it was surprisingly different and kind of what you are looking for i believe.

[CraftyChara]

Justin wrote: "I just finished Dark Matter by Blake Crouch and it was surprisingly different and kind of what you are looking for i believe."

I did read it and it was what I was looking for.Thanks

[CraftyChara]

Rosa wrote: "Through the Medicine Cabinet
All the Zack Files books are hilarious. Probably too young for you, but otherwise just what you're looking for."

I'll check it out. Who knows it could be a hidden gem of a book.

[Lydia]

The time quintet by Madeline L'engle

[CraftyChara]

Lydia wrote: "The time quintet by Madeline L'engle"

Thanks.

[Lydia]

They are a little rough to get into sometimes but it is well worth the read.

[CraftyChara]

Lydia wrote: "They are a little rough to get into sometimes but it is well worth the read."

I know I read them. Many Waters is my favourite.

[Rosa]

Of course, the classic is Through the Looking-Glass.
And I see you've added Neverwhere, which is one of the best.