The Maze Runner series by James Dashner.
There are four books in the series.



The synopsis of the first book, The Maze Runner is:
When Thomas wakes up in the lift, the only thing he can remember is his first name. His memory is blank. But he’s not alone. When the lift’s doors open, Thomas finds himself surrounded by kids who welcome him to the Glade—a large, open expanse surrounded by stone walls.

Just like Thomas, the Gladers don’t know why or how they got to the Glade. All they know is that every morning the stone doors to the maze that surrounds them have opened. Every night they’ve closed tight. And every 30 days a new boy has been delivered in the lift.

Thomas was expected. But the next day, a girl is sent up—the first girl to ever arrive in the Glade. And more surprising yet is the message she delivers.

Thomas might be more important than he could ever guess. If only he could unlock the dark secrets buried within his mind.

Downside Ghosts series by Stacia Kane
5 Books total in the series:



Synopsis of first book in series Unholy Ghosts:
THE DEPARTED HAVE ARRIVED.

The world is not the way it was. The dead have risen, and the living are under attack. The powerful Church of Real Truth, in charge since the government fell, has sworn to reimburse citizens being harassed by the deceased. Enter Chess Putnam, a fully tattooed witch and freewheeling ghost hunter. She’s got a real talent for banishing the wicked dead. But Chess is keeping a dark secret: She owes a lot of money to a murderous drug lord named Bump, who wants immediate payback in the form of a dangerous job that involves black magic, human sacrifice, a nefarious demonic creature, and enough wicked energy to wipe out a city of souls. Toss in lust for a rival gang leader and a dangerous attraction to Bump’s ruthless enforcer, and Chess begins to wonder if the rush is really worth it. Hell, yeah.

The Stephanie Plum series by Janet Evanovich
There are 19 books in this series.



The synopsis for the first book in the series, One For The Money:
Welcome to Trenton, New Jersey, home to wiseguys, average Joes, and Stephanie Plum, who sports a big attitude and even bigger money problems (since losing her job as a lingerie buyer for a department store). Stephanie needs cash--fast--but times are tough, and soon she's forced to turn to the last resort of the truly desperate: family.

Stephanie lands a gig at her sleazy cousin Vinnie's bail bonding company. She's got no experience. But that doesn't matter. Neither does the fact that the bail jumper in question is local vice cop Joe Morelli. From the time he first looked up her dress to the time he first got into her pants to the time Steph hit him with her father's Buick, M-o-r-e-l-l-i has spelled t-r-o-u-b-l-e. And now the hot guy is in hot water--wanted for murder.

Abject poverty is a great motivator for learning new skills, but being trained in the school of hard knocks by people like psycho prizefighter Benito Ramirez isn't. Still, if Stephanie can nab Morelli in a week, she'll make a cool ten grand. All she has to do is become an expert bounty hunter overnight--and keep herself from getting killed before she gets her man.

The October Daye series by Seanan McGuire.
There are 6 books in the series.



Synopsis of the first book, Rosemary and Rue:
The world of Faerie never disappeared: it merely went into hiding, continuing to exist parallel to our own. Secrecy is the key to Faerie's survival—but no secret can be kept forever, and when the fae and mortal worlds collide, changelings are born. Half-human, half-fae, outsiders from birth, these second-class children of Faerie spend their lives fighting for the respect of their immortal relations. Or, in the case of October "Toby" Daye, rejecting it completely. After getting burned by both sides of her heritage, Toby has denied the fae world, retreating into a "normal" life. Unfortunately for her, Faerie has other ideas.

The murder of Countess Evening Winterrose, one of the secret regents of the San Francisco Bay Area, pulls Toby back into the fae world. Unable to resist Evening's dying curse, which binds her to investigate, Toby is forced to resume her old position as knight errant to the Duke of Shadowed Hills and begin renewing old alliances that may prove her only hope of solving the mystery...before the curse catches up with her.