On her senior French trip, seventeen-year-old Ruby follows her classmates into the Paris catacombs to attend an exclusive party, but they quickly become entangled in a sinister pursuit underground and uncover dark secrets about the catacombs and each other.

After being jilted by her ex-boyfriend and best friend, Jade couldn't be more ready to embark on the adventure of a lifetime: 11 countries in 4 months, all from the luxurious Campus on Board ship. She is happy to wedge an entire globe between her and the people who broke her heart. When Jade discovers the backstabbing couple are also setting sail, her obsession with them festers into a shocking murder. As their friends begin to drop like flies, Jade...