Five-0 investigates the murder of a wedding crasher, and their prime suspect is the runaway bride. Meanwhile, Danny makes a big decision regarding his relationship with Gabby. Rebecca De Mornay guest stars.
When Aunt Vi is the lone juror on a murder trial who believes the defendant is innocent, McCall covertly instigates the case to find proof that Vi's instincts are correct.
While in Los Angeles to receive cosmetic injectables certification, Peter tries to track down Maria Menounos and Mindy runs into Casey.
When a jogger's body is found, the Cyber team use the fitness tracker she was wearing at the time of the murder to retrace her steps for the entire night leading up to her death.