At the B & N Teen Blog she tagged six "of the most suspenseful and chilling young adult hostage books around," including:
The Masked Truth, by Kelley ArmstrongRead about another entry on the list.
This action-packed thriller will haunt you long after the last page, as it plays with themes of trust, forgiveness, and strength in the most terrifying and violent way. Riley suffers from PTSD, a result of witnessing the brutal murder of her neighbors, and Max has received a medical diagnosis that changed his life. The two teens wind up at the same intensive weekend therapy camp, but things go awry when three masked men break in and take the teens hostage. From start to finish, the book is nonstop action and twists, so it’s best to clear some time before you start. You won’t be able to put it down.