In Wild Werewolves, a stranger approaches Zoey and Kyle in the library as they ask the question: "Do you think monsters exist in London?" The stranger gives them information that sets them on a city-wide adventure with Ashley and Tyler. The Mystery Club pieces together the werewolf mystery and the identity of the stranger and a zany series of events ensues.

In Mummy Mischief, train passengers spot a mummy in the subway. Then it happens again! The occurrences are uncanny and strange enough to lure the Mystery Club to action. As they unwrap the mysteries of the mummy appearances, they unearth even more hijinks than they bargained for.