The true-life mysteries detailed in this series are about revenge, betrayal and murder carried out by people.

Crime-mystery series that zeroes in on a critical, lost gap of time during the day of a homicide. Once that gap’s pieced back together, it breaks the case wide open.

A look at the hunt for California’s Zodiac Killer, who murdered at least five people in the San Francisco Bay Area in the late 1960s and early ’70s.

Explores a series of shark attacks that happened in the same patch of ocean, in the remote islands of the Whitsunday in Australia.