The third book in an exciting new middle grade mystery series from actress, artist, and YouTube star Hayley LeBlanc!In Hayley Mysteries: The Secret on Set, Hayley has the lead role in a TV show about a young detective, and when strange things happen around the studio, she and her friends become real-life sleuths.Now Hayley and her co-stars investigate their most spine-chilling case yet!Working on a Hollywood set, Hayley's seen all kinds of creepy special effects.When she comes across what appears to be a dead body under a sheet at Silver Screen Studios, though, she's sure she's found evidence of a real crime!But when she brings the security guard back to the scene, the body has vanished, and it seems someone in the cast or crew is playing a mysterious prank.Could the culprit be the show's latest guest star, who's famous for his vampire films?It's up to Hayley and her two best friends to find out!