Tower Block (2012)

British thriller starring Sheridan Smith and Russell Tovey. Three months after a boy was brutally murdered on the doorstep of his high-rise flat, the building has been condemned and the remaining residents are preparing to move out. Some won't make it, however, as before they can relocate, a mysterious sniper starts picking off the tenants.

Tenacious Becky (Sheridan Smith) takes the lead as a group including local thug Kurtis (Jack O'Connell) and pathetic alcoholic Paul (Russell Tovey) battle to survive and fight back against their attacker.