In Dateline NBC’s newest podcast “Mommy Doomsday,” Keith Morrison picks up where he left off with “The Thing About Pam,” applying his unique reporting style to a true crime mystery. Where are Lori Vallow’s missing children? Why have so many people around her suddenly died? And does her religious cult focused on the apocalypse have anything to do with it?

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In 2017, a Swedish journalist was last scene departing with a man in his homemade submarine. When the sub is scuttled and the man says he buried her at sea after an accident, police take on the impossible task of scouring the ocean to disprove the alibi. The six-part Danish-language series “The Investigation,” now on HBO, is a dramatic take on one of Scandinavia’s most bizarre crimes.

FOR OUR SPOILER-FREE REVIEWS OF "THE INVESTIGATION" GO TO 56:00

In Crime of the Week: free flow of commerce.