Laura and Nico take off for Spanish Harbor to track down the identity of the killer. Tom, desperate to get Serena back, sends the police after them. Also, a witness leads Nico to confront Danny, who reveals the shocking truth about Susannah’s murder.

Laura convinces Nico that they need to find the fourth man from the tattoo photo; while doing so, they learn more about the case 10 years ago against Danny. Also, Laura gives Tom a chance to explain his actions and must decide whether she – and Serena – can trust him.

Tom comes to Laura with his own plan to save Serena, but a double-cross turns deadly, and the identity of the real killer is exposed. Meanwhile, with Danny’s execution just hours away, Nico and Laura have to race to try saving him and Serena.