The rundown London apartment building Tower Block 31 becomes the site of a desperate fight for survival, in this nail-biting British suspenser. Months after she tried to help a teen who was brutally murdered in the hallway of her building, a young woman and her fellow residents must band together when they find themselves hemmed in by deadly booby traps as a sniper picks them off one by one. Sheridan Smith, Jack O'Connell, Ralph Brown star. 87 min. Widescreen; Soundtrack: English; audio commentary; more.