When food critic Hayley Snow receives an intriguing email about a mysterious, decades-old disappearance, her curiosity is piqued. Writer Catherine Davitt has returned to the Keys to research a book about Hemingway's wives, but she's also on the hunt for the truth about her missing friend. Hayley quickly agrees to help investigate and they hit the road to see what clues they might find.

Back in the late 1970s, Catherine and her friend Veronica were part of a group of lost souls camping in the mangroves of Big Pine Key, until Veronica vanished, and the sheriff's office cleared out the camp. Catherine and Hayley begin interviewing Big Pine Key residents who were around at the time of Veronica's disappearance but uncover more questions than answers.

Catherine and Hayley stop to speak with a motel owner who frequented the fringes of the commune, but they find him stabbed to death. Then Catherine also goes missing, and signs point to a connection between the old case and the new murder. It's up to Hayley to unravel the knot of secrets and lies before time runs out.