In 2007, four friends returned home from a week in Ibiza with secrets to keep. When they agreed never to contact each other again, all traces of their holiday were erased. Or so they thought.

Now, almost seventeen years after that trip, Anna's sister Kim is still picking up the pieces after Anna abandoned her life without warning. Kim is sure that Anna's unexplained departure had something to do with her visit to Ibiza. And when a photo from the trip surfaces unexpectedly, she finally has some clues to start looking into what happened to her sister.

Julia, Cora and Faye are forced to come together when they realise someone might be looking into the past. But how far will they go to bury the truth? And what's to stop one of them from letting a 'friend' take the fall, in order to save herself?