Longworth investigates the death of a famed treasure-hunter who was after a Spanish ship believed to contain billions of dollars in booty. Longworth must figure out if the victim was close to finding the treasure and if that's what got him killed. Callie's passion for treasure hunting lore sets her and Longworth on an adventure that just might change their lives.

The murder of a woman who contacted the Innocence Project to exonerate a death row inmate now forces Jim to team up with the detective who investigated the original case: Jim's former partner when the Florida State Attorney General's office calls her to testify against the IRS agent who handled her audit and tried to extort her for sex a few years back. Reluctant to take time off to help the State Attorney, Callie is surprised when Miranda is not only supportive of her request, but also learns that Miranda has been the victim of sexual harassment herself, and the two women bond through their shared experience.