Fright at the museum

"A school field trip gives Scarlett, Mags, and Luna their first shot at cracking a new G.H.O.S.T. Squad case. Someone--or something--is causing mayhem at the museum. Spooky sounds and freaky happenings are terrifying the staff, and if things don't get back to normal soon, they mayall quit. Could somone be playing a trick on them, or is an unhappy spirit to blame?"--Back cover.