A marine biology student goes missing from a party held for her before she embarks on a new project. The team initially suspect that her boyfriend may be responsible, but when they meet his identical twin brother, they realise that he may actually be the true culprit. Witnesses report hearing an argument between the missing woman and her boyfriend that may have been about the brother and when Martin digs into the past of the two men, he finds several disappearances that could be related to the current one the team are investigating. The team must race against time to discover which brother is truly responsible.
