NYPD Detective Danny Reagan takes a job with the Boston PD and is paired with Detective Lena Silver, part of a law enforcement family comprised of District Attorney Mae Silver, Police Superintendent Sarah Silver, rookie cop Jonah Silver and Rev. Edwin Peters. Reagan hopes to reconnect with his son, Sean, in Boston.

In a world where terror lurks just beyond the threshold, every spellbinding episode of Don't Open the Door reveals the chilling true-crime tale of unsuspecting individuals whose lives are forever changed after a knock at their door.