Five-0 investigates to civilians that were killed up on the mountains, when that find a video that victims recorded it appears to be weaponized drones. Later on, it's revealed that the shootings were random, the drone later appears in the city of O'ahu and starts shooting at random civilians and kills and injures dozens more. The motive for the criminal appears to be revenge on the task force. Meanwhile, Kono has concerns when Adam asks her to marry him, Chin Ho is also questioned about a recent bribe from a previous take down. Elsewhere, Danny's con brother is captured and has to pay back whatever he took from the capturers.