One dark and stormy night, Ghoulia’s cousin Dilbert comes to visit her at Crumbling Manor. She’s confused—she didn’t invite him, and it turns out that Dilbert’s a real grouch. He complains about everything! When Ghoulia tries to track down Auntie Departed to find out why she invited Dilbert, she finds that Auntie has vanished. Ghoulia can’t find her. And the doorbell won’t stop ringing. One after another, Ghoulia’s friends arrive—all with the same mysterious invitation in hand. As the gang searches Crumbling Manor for Auntie Departed, one of their own goes missing. Finally, Dilbert inadvertently solves the mystery in the greenhouse when he finds himself face-to-face with the sinister Chatterbox Ivy.