"The Merciless is chilling...think 'Mean Girls' meets 'The Exorcist.'"--MTV.com

"Pretty Little Liars fans, get a sneak peek at your new favorite book The Merciless...a nail biting thriller."--Seventeen Magazine

Brooklyn Stevens sits in a pool of her own blood, tied up and gagged. No one outside of these dank basement walls knows she's here. No one can hear her scream.

Sofia Flores knows she shouldn't have gotten involved. When she...