When her husband is accused of murder, solicitor Anne Travers defends him -- but as the evidence mounts, she begins to question their "perfect" life.

A who-is-it setting in the claustrophobic corridors of an abandoned and locked-off office building that has several guests invited to a party by their mysterious, unknown host. Only it is they who are the victims of their crimes. Suspense and mistrust are not the only stalker in this cat and mouse game of wits and fear. Who is the stalker? Why is he killing? And what is it exactly that everyone here has in common?