The famouse opera singer Violetta von Cacklefur is in Gloomeria to perform at the Royal Mousetropolitan 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!
A strange epidemic has broken out --- mice everywhere are covered in weird blue spots! Mouse Island's most famouse doctor immediately sets to work with his team to try to find the cure...but someone is trying to stop him. Can he figure out who before he ends up blue himself?
Creepella's father, Boris von Cacklefur, is a finalist in the Fright Night contest --- Gloomeria's prestigious poetry competition. If he can perform the most terrifying rhymes, he will be crowned Fright Night Idol! But midway through the contest, Boris mysteriously disappears. Can Creepella and her friends find him before the final round?
Geronimo Stiltonoot is Geronimo Stilton's ancient ancestor. He runs the newspaper in his prehistoric village, and when the village is in an uproar because the Stone of Fire has been stolen from the mouseum, it is up to Geronimo Stiltonoot and his cavemouse friend, Hercule Poirat to solve the case!