Gr 4–8— A third series installment that is sure to be popular with new and returning readers. Hayley and her best friends are actors on the television series Sadie Solves It at Silver Screen Studios, where there is always plenty of friendship drama and preteen growing pains. The cast is preparing to film their Halloween episode when a mysterious actor, who plays a vampire and is rumored to sleep in a coffin, appears on set; bodies are being found on sound stages and then disappearing; a new personal assistant seems to be causing chaos; and things keep going missing. The team of sleuths realizes there is a prankster on the loose, and it is up to them to unmask the culprit. Young people interested in acting will find the writing particularly exciting, with a behind-the-scenes glance into things like table reads, call sheets, and craft services. VERDICT Young readers looking for their next mystery series, with a touch of TV glamor, will enjoy this story of friendship and growing up.— Peggy Henderson Murphy