Sharni Vinson heads the cast of this superior horror film that delivers taut suspense, gory terror and a streak of dark comedy.

Three assailants wearing animal masks breach the secluded woodland estate where members of a bickering upper-crust clan are celebrating a 35th wedding anniversary-cum-uneasy family reunion.

What neither the stunned family nor the remorseless attackers have counted on, however, is that Vinson’s tough-as-nails guest is equipped with the survival skills to fight back…

Further twists and turns wrongfoot the viewer, too, while the prickling undercurrent of class tension adds extra charge to the mayhem.