When his 8-year-old son is abducted, a widowed crime writer looks to his estranged father, a retired former police detective, for help, only to discover a connection with the decades-old case of a convicted serial killer known as "The Whisper Man."

In a small town in Maine, seven children known as The Losers Club come face to face with life problems, bullies and a monster that takes the shape of a clown called Pennywise.