After Maggie's sister, Erin, goes missing, the team begins an all-out search to recover her. But when Maggie discovers Erin was kidnapped by a sinister figure from her past, she must race to save her before it's too late.

A double homicide in Brooklyn sets the team after a corrupt longshoreman but they soon discover something sinister has been smuggled into NY. As they race to stop the threat, Isobel enlists the help of CIA's Deputy Chief of Station Nikki Reynard.