When twelve-year-old, UFO-obsessed, Lucy Sladan sneaks out in the middle of a thunderstorm to investigate the unexplained disappearances in her hometown of Sticky Pines, she finds more than she bargained for: a huge hairy creature, a thirteen-year-old stranger named Milo Fisher and a deep-rooted secret. Together, Lucy and Milo become entwined in a mystery that threatens to engulf the whole town of Sticky Pines and its weird and wonderful residents.