Creepella von Cacklefur

"Something is wrong with Gorgo, the monster in the moat of Cacklefur Castle! Creepella discovers that he is lovesick for the monster Blobbina, who also happens to be a famous movie star. But when Creepella delivers Blobbina a love letter from Gorgo, she finds out Blobbina has disappeared! Creepella and Billy Squeakspeare head to Horrorwood to search for the missing Blobbina. Will they ever find her?"

A mysterious old friend of Grandpa Frankenstein (he's a vampire) shows up one night on the doorstep of Cacklefur Castle. 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.

"The fair has come to Mysterious Valley! Creepella is looking to forward a fun, thrilling day of rides and games with her family and friends. But one spooky rollercoaster seems to be making everyone who rides it disappear! Creepella is determined to get to the bottom of the mystery -- but what will happen when she rides the coaster herself?" -- summary from amazon.com

"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.