Aunt Agatha has died... and one of her 12 heirs or heiresses is the killer.  Was it:

Poopsie: Aunt Agatha's beloved but sadistic persian cat?
Beauregard III: Agatha's flirtatious lover?
Smothers: the butler who served Agatha's family for over thirty years?
Dusty: the conniving mai?
Charity: Agatha's personal physician who only makes 'mansion' calls?
Lulu: Agatha's gossip of a best friend?
Parker: the Chauffeur?
Clay: Agatha's tennis coach?
Spritzy: Agatha's favourite hair stylist?
Pierre: the inept chef?
Madame Astra: Agatha's personal faux fortune-teller?
Hickory: the mansion's gardener?

But be warned... a Detective is roaming the halls searching for the killer.  It's kill or be killed in the reincarnation of 1313 Dead End Drive...and only 1 person will make it out alive...