The island of O'ahu goes on lockdown when Five-0 hunts a terrorist who starts using weaponized drones on civilians. Meanwhile, McGarrett and Danno must go for a mandated review with a psychologist, resulting in a session which looks a lot like couples therapy.
Trevor has a difficult time adjusting to houseguests; Denise's old friend becomes a new face on the base; Pamela struggles with being away from Chase.
When Jenny makes the decision to confront her father, family turmoil from the past rises to the surface. Meanwhile, Atticus Nevins returns to town, bringing more danger than the FBI could have imagined.
Teaming up with Grayson (Jackson Hurst) to supervise a law student’s suit on behalf of a computer company employee puts Jane (Brooke Elliott) at odds with her former Stanford Law School mentor. Meanwhile, Kim (April Bowlby) begins to suspect that the firm’s creditor Gina Blunt (Madchen Amick) is up to no good.
