You all die tonight

Seven people wake up in a remote mansion. The doors are all locked. They have no idea where they are. Who brought them there. Or how to escape. Each knew the victims of a dreadful crime committed four years earlier but that's all that links them. Then a voice echoes through the house with a terrifying message. They've been poisoned -- and have less than 12 hours to live. There's an antidote on hand: but only if someone admits to being a killer. A...