Neil Gaiman is an amazing author! Any of his books are good. Try Neverwhere, Stardust or Coraline.
Edgar Allen Poe is a really good author. Check out his poems and short stories.
13 Little Blue Envelopes by Maureen Johnson
Abarat by Clive Barker, Make sue you get the hardcover version though!!! If you liked the first one be sure to check out the next book in the series Abarat: Days of Magic, Nights of War.
Daughters of Destiny series: Keeper of the Winds by Jenna Solitaire, If you enjoyed the first one check out the next three books in the series. Keeper of the Waters, Keeper of the Flames and Keeper of the Earth.
The Abhorsen Trilogy (Sabriel, Lirael, Abhorsen) by Garth Nix
The Maximum Ride series (The Angel Experiment, Schools Out Forever, Saving the World and Other Extreme Sports, The Final Warning) by James Patterson
His Dark Materials trilogy (The Golden Compass, The Subtle Knife and The Amber Spyglass) by Philip Pullman
The Riddles of Epsilon by Christine Morton-Shaw
The Haunting of Alaizabel Cray by Chris Wooding
Holes by Louis Sanchar
Impulse by Ellen Hopkins
The Secret Under My Skin by Janet McNaughton
Define “Normal” by Julie Ann Peters
Go Ask Alice by Anonymous
The Sight and Fell by David Clement-Davies
Tuesdays With Morrie by Mitch Albom
Wake by Lisa McMann