When Iggy Morales's stylish cat, Tuba, becomes famous on social media, he scores an invite to a star-studded pet fashion show at Spooky World. The family-friendly, Halloween-themed indoor carnival is the place to be on the last weekend in October, so of course Iggy brings all of his friends, including Clip and Sadie. The kids expect to ride thrilling rollercoasters, play games in the midway, and eat fried dough and candy apples, but they encounter a different kind of excitement instead: a ghost called the Weeping Lady, who has haunted Spooky World for decades, appears and asks for their help.

The Weeping Lady sends Iggy and his friends on a mysterious, action-packed scavenger hunt all over the sprawling theme park, giving them cryptic clues and communicating with Iggy's seemingly clairvoyant cat, Tuba. If the kids can piece the story together and complete this wild ghost chase, they might just uncover the truth behind what really happened to Spooky World's most infamous spirit.