Adam Plantinga is part of the Internet Crimes Against Children unit with the San Francisco Police Department whose first two nonfiction books— 400 Things Cops Know and Police Craft— have become his calling cards to the world of thrillers. 400 Things was nominated for an Agatha, a Macavity, and was deemed “the new Bible for crime writers” by the Wall Street Journal. Adam’s fiction debut, The Ascent became a USA Today bestseller.