Growing up in 1980s Niagara Falls - a seedy but magical, slightly haunted place - Jake Baker spends most of his time with his uncle Calvin, a kind but eccentric enthusiast of occult artifacts and conspiracy theories. The summer Jake turns twelve, he befriends a pair of siblings new to town, and so Calvin decides to initiate them all into the ''Saturday Night Ghost Club.'' But as the summer goes on, what begins as a seemingly light-hearted project may ultimately uncover more than any of its members had imagined.