When Stink's parents win an aquarium sleepover, he and his two friends enjoy a scavenger hunt before trying to fall asleep while worrying about the frankensquid on the loose.

On her eighteenth birthday, Cleo receives a mysterious invitation to a scavenger hunt. She's sure her best friend Hope or her brother Connor is behind it, but no one confesses. And as Cleo and Hope embark on the hunt, the seemingly random locations and clues begin to feel familiar. In fact, all of the clues seem to be about Cleo's dead boyfriend, Declan, who drowned on a group rafting trip exactly a year ago. A bracelet she bought him. A song he loved....