The Lost by Natasha Preston New

nEW paperback In Piper's hometown, teenagers keep disappearing, and everyone assumes they're just a bunch of runaways. But when yet another person disappears, Piper and her best friend Hazel suspect something more sinister is going on. So they decide to investigate, determined to learn the truth. But the building isn't only meant to keep them imprisoned; every room is a test to see if they can make it out alive.