Packages with disturbing contents are sent to six people across Washington DC. Simmons and Kristy struggle to connect with David.
The team look into a case involving the kidnapping of multiple women, one of whom was never reported missing.
The team search for a stolen painting valued at $40 million after online chatter indicates the artwork is being sold on the black market to fund terrorist activity.
Duke requires the help of the Five-0 after he is forced to steal crucial evidence to save his kidnapped granddaughter. Meanwhile, Jerry goes undercover in a mental health facility.
Loners and men who won't be missed are being targeted by a killer, while Jane finds that keeping her pregnancy quiet will not be easy.