Carnival of Monsters by Andrew Beasley
Roll up, roll up, if you dare to Doctor Vindicta's carnival! Gasp at the dancing ghosts! Grimace at the creepy clowns! Giggle in the hall of mirrors!
It's all harmless fun and frights... until a young boy disappears. The police believe he's run away, but his sister swears he was snatched by a monster.
Only the cleverest detectives can catch a demon: send for Billy Flint and Charley Steel aka S.C.R.E.A.M. - top-secret investigators of Supernatural Crimes, Rescues, Emergencies And Mysteries.