One simple sacrifice is all they need. Cast a stone. Aim true. Let her sink. Nate can't believe he's dragged himself up to this backwater town. Port Flinders would have fallen off the map years ago, except for one thing. Tourists flock to its mangrove-lined shores for the annual Drowning Girl festival: sacrifice a girl at sea, and the fishing hauls that keep the town afloat will prosper. Or don't and the whole town will sink. But it's just a legend, a gimmick. Everybody knows that. As fireworks light up the night sky, a woman's body is pulled from the inky waters of the gulf. Shock waves threaten to tear Port Flinders apart when she's identified as Kelsey Webb: a local teenager thought dead for twenty-five years. As Nate tries to find the truth about what happened to Kelsey, he uncovers a string of deadly accidents over the decades. All women. All drowned. And always during the festival. In his search for answers, the legend of the Drowning Girl begins to take hold of Nate, weaving its way into his head and threatening to pull him under, and he begins to question which sacrifices are truly necessary.