The worst thing ever to happen on Hemlock Circle occurred in Ethan Marsh's backyard.

On 15 July 1994, ten-year-old Ethan and his best friend Billy fell asleep in a tent on a manicured lawn in a quiet New Jersey cul-de-sac. But in the morning, Ethan woke up alone - the tent had been sliced open with a knife, and Billy was gone. Never to be seen again.

Thirty years later, Ethan has returned to his childhood home, still desperate for answers. Who took Billy?

Every night, he's kept awake by strange disturbances on the street, happening under the cover of darkness. Are they still out there?

This isn't a bad neighbourhood. These aren't bad people. Are they?