In post-Soviet Siberia, women were disappearing from the streets of Angarsk. Their bodies turned up in forests and industrial wastelands, mutilated beyond recognition. The weapons changed every time, but the tire tracks at the scenes were always from the same vehicle: a Lada Niva, the standard-issue Soviet police truck.

The man driving it was Mikhail Popkov: junior police lieutenant, champion biathlete, beloved neighbor, husband and father. His wife Elena, a fellow officer in the same department, called him a 'perfect husband and father.' His colleagues said he was the soul of every party. When women were attacked on his city's streets, he was often first on scene.

Because he was the one who had attacked them.

Popkov used his badge, his uniform, and the trust people place in law enforcement to lure women into his patrol vehic ...