Doomsday

A survivalist is believed to have died from halomethane poisoning in his protective fallout shelter, until Maura deems the death "suspicious" since alternative methods to the gas exist today. The team investigates the victim's means of survival if he were to have exited the shelter after a catastrophe. Meanwhile, Angela asks Jane to find out why Frankie is being secretive, but Jane wishes to know the same about Korsak.