The famous opera singer Violetta von Cacklefur is in Gloomeria to perform at the Royal Mosetropolitan Theater! But the mischievous phantom of the theater has an old grudge against her. It's up to Creepella and Geronimo to track him down in the theater's spooky basement...before the curtains rise and he ruins the show! -- Back cover.

Creepella and her niece investigate Squeakspeare Mansion in an attempt to interview ghosts.

Geronimo and his friend Hercule Poirat are called to investigate a ghost haunting at the famouse Grand Hotel in New Mouse City.

"A mysterious old friend of Grandpa Frankenstein shows up one night on the doorstep of Cacklefur Castle. He's a vampire-- and he needs the von Cacklefur family's help. His ancient castle has been infested by strange and troublesome monsters and ghosts, and he's afraid he'll have to move out because of them! ... It's up to Creepella and her family and friends to help this vampire save his home"--P. [4] of cover.

Geronimo is taking his Benjamin on a trip to Rome to learn the city's history (and keep him from failing fifth grade), but when they arrive they are immediately pulled into the investigation of the "ghost" of a gladiator that seems to be haunting the Colosseum and scaring tourists away.