When a multi-million dollar racing yacht sinks during a race, Don and his team are called to investigate after the treasure hunt to find the wreckage turns deadly.

The FBI asks Charlie to retrace the path of a marine salvage barge because Don suspects a murder took place on board. However, Charlie is put in a difficult situation when the National Security Agency (NSA) also requests his help to find the yacht for the confidential case they are working on. Meanwhile, Liz and Don try to figure out a way to make their personal relationship work after she is permanently transferred to LA.

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