With the same vibe as Pretty Little Liars, Seven Dirty Secrets by Natalie D. Richards (£9) is chilling to its core. After Cleo's boyfriend, Cyrus, drowned on a group rafting trip exactly a year ago, Cleo is invited to a mysterious scavenger hunt. All the clues in the hunt tie back to her boyfriend, and before long, she realises that someone knows what really happened to Cyrus, and she's in trouble.