Americans are afraid of many threats to their lives – serial killers, crazed gunmen, gang bangers, and above all terrorists – but these threats are surprisingly unlikely. Approximately three-quarters of all homicide victims in America are killed by someone they know. And the real threat from strangers is quite different from what most fear: one-third of all Americans killed by strangers are killed by police.

This is the story of the hidden numbers of police homicides in the United States. The killings of Michael Brown, Eric Garner and Walter Scott have increased the world’s attention to US police violence, yet most Americans underestimate the threat posed by the people charged with keeping them safe.

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