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When skeletal remains are found in a void space on a mothballed carrier, Rabb and Mac must investigate this mysterious occurrence. However, during their investigation, Rabb falls through an unmarked hole in a corridor floor, giving him a concussion. Rabb must find his way out to receive medical treatment. He begins to see the vague shape an Officer who leads him not to safety, but instead to a crew birth which might provide the answer to decade’s old murder.