Description from Google Books:

#1 NEW YORK TIMES BESTSELLER • From the author of the multimillion-copy bestselling A Good Girl’s Guide to Murder series comes a new blockbuster thriller about a road trip that turns deadly. Eight hours. Six friends. Five survive. Red Kenny is on a road trip for spring break with five friends: Her best friend - the older brother - his perfect girlfriend - a secret crush - a classmate - and a killer. When their RV breaks down in the middle of nowhere with no cell service, they soon realize this is no accident. They have been trapped by someone out there in the dark, someone who clearly wants one of them dead. With eight hours until dawn, the six friends must escape, or figure out which of them is the target. But is there a liar among them? Buried secrets will be forced to light and tensions inside the RV will reach deadly levels. Not all of them will survive the night. . . . With edge-of-your-seat tension and a gripping mystery, Holly Jackson has written another instant classic! And don't miss Holly Jackson's latest mystery thriller, The Reappearance of Rachel Price!

Snippet from Google Books:

When their RV breaks down in the middle of nowhere with no cell service, they soon realize this is no accident. They have been trapped by someone out there in the dark, someone who clearly wants one of them dead.