On a cliff-face in New Zealand, two men fall to their deaths carrying the secret of a horrifying betrayal. Four years before, the bright and beautiful Luce, another member of the same close-knit group of friends, had also died tragically while climbing. As the circle of friends dwindles, Luce's best friend, Anna, persuades Josh, Luce's ex-lover, to help in her own investigation, as she's convinced that the original verdict of accidental death was wrong. Had detail been overlooked, or, worse, ignored? In an attempt to uncover the truth, Josh and Anna follow Luce's last days to Lord Howe Island, but the long-cold trail and conspiratorial islanders seem certain to defeat them. After all, who could possibly have a reason to murder Luce?