Mystery Inc. is summoned to investigate occurrences in a haunted villa, where a black knight terrorizes anybody who tries to get close to treasure hidden by the former owner of the building.

Suspicion is on high after Batman, Batgirl, Robin and other DC superheroes receive mysterious invitations. However, family values must remain strong when Batman and his team encounter the villainous Red Hood, who is obsessed with destroying the Bat-family and all of Gotham City.