Five-0 is called in to locate a dangerous escaped prisoner and to find him they need to determine his reasons for escaping. Steve's sister, Mary Ann arrives from the mainland for a visit and brings trouble of her own.
Naval Criminal Investigative Service Special Agent Leroy Jethro Gibbs leads a group in investigating crimes - ranging from murder and espionage to terrorism - that have evidence connected to Navy and Marine Corps personnel.
After Torres and Bishop are victims of a hit-and-run, Torres fights for his life in the Intensive Care Unit.
A Cuban spy escapes custody before a prisoner exchange.
David decides to settle his debt with Victoria; Emily helps Nolan with his own takedown.