Ronnie's party is going well, but his mother Alice is waiting for her husband Tom to return from the office to help supervise. The doorbell rings, but instead of Tom it's Simon Potter, a strange little boy who Ronnie dislikes, and who knows some unusual and horrifying variations of children's party games.

Blinker, so named because he blinks whenever he has a bright idea for a new invention, is the son of an eccentric Professor who is developing a top secret Pulsar Crystal X. Blinker's inventions help him to be a successful goalkeeper and to keep an eye on The Masons gang - and some real crooks.

Stephen Chambers, a new master of Warby Stones school for the 'ultra-intelligent boys', finds strange things happening to him. Reason tells him that they must be linked with the boys' Psychic Phenomena Club.