What are some YA books which aren't in a series?

[Yasmine]

I feel Like reading something but I don't want to get hooked into an entire series just now Because I got other books to read for school. I just need one book as my "Relief Book" from uni and Life!

[Rahel]

memoirs of a teenage amnesiac, elsewhere, so yesterday, graceling (because the sequel is a spinoff which you really dont have to read), the scorpio races, and the water wars (but the water wars kind of feels unfinished)

[Marceline]

Lament(there is a spin off you don't have to read.)Stolen, Looking For Alaska (<3) , and yeah Elsewhere is a really amazing book, too.

[Kirby]

the book thief

[Lys]

[Marisa]

[Kathy]

Girl, Stolen
The Duff
Babe in Boyland
Anna and the Frenchkiss (there are companions)
Cryer's Cross
Fateful
North of Beautiful
Before I Fall
Jane
Falling in Love With English Boys
Enthusiasm
Don't Breathe a Word
Along For the Ride
Sing Me to Sleep
Fixing Deliah
Anything by Jennifer Echols, Lisa Schroeder, Lauren Barnholdt, Alex Flinn, and Simone Elkeles

[Prerna]

The Space Between by Brenna Yevanoff
The Alchemist by Paulo Coelho
The Splendor Falls by Rosemary Clemente Moore
The Last Song by Nicholas Sparks
Thirteen Reasons Why by Jay Asher
Beautiful Disaster by Jamie McGuire
The Beginning of After by Jennifer Castle
Raven by Allison van Diepen

[Tasha]

Bleeding Violet by Dia Reeves

[♥ Alexia -Team Malec ♥]

Sweet Evil, By Wendy Higgins. Havn't read it but i really want to.
By the way, have any of you read any of Nicholas Spark's books? are they any good. i have 'at first sight' and want to know if it's worth reading.