While investigating the disappearance of the original Mystery Inc. gang that disappeared, the gang discovers that they were last seen going in to the abandoned mansion once owned by THE DARROW FAMILY, the very family that founded Crystal Cove. But once inside the mansion, they find themselves trapped by a crazy old man - DANNY DARROW, the youngest member of the Darrow family - who has been living there for decades. He's booby-trapped the whole house to make sure that no one tries to steal "his treasure". It's up to Fred to try and outwit his traps, because if he doesn't... the gang will never leave that mansion again.
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