The NCIS team must investigate a series of crime scenes that appear to be copy-cats of previous cases. Also, two of Gibbs' ex-wives, one of which the team has yet to meet, show up at a crime scene to discuss something important with him.

Gibbs and the team investigate when a Navy lieutenant who is set to be the first openly gay servicemember to receive the Medal of Honor is murdered. Also, as his wife's due date approaches, Palmer prepares for fatherhood with a NCIS baby shower.