Dangerous Plays — Carolyn Keene

Dad, Bess, and I are all set for London when Ned's Shakespeare professor asks us to do a simple favor: to take a look at his townhouse while we're there, since he can't seem to locate the housekeeper and fears something's wrong. Sounds easy enough, so I take the key.

Eager to cross the favor off our list, we stop by 53 Banbury Square shortly after we land. And let's just say things in the townhouse aren't quite tip-top. And the key? Well, it unlocks a Pandora's box of serious trouble.