Supernatural horror film Don’t Knock Twice releases in Canada today Hot actress Katee Sackhoff continues her reign as a contemporary genre film figure with the acclaimed new feature horror film Don’t Knock Twice. The supernatural shocker – which opened in the US earlier this month – is being released today across Canada on iTunes and VOD via Raven Banner Releasing and we have some photos and the new trailer to share. Don’t Knock Twice stars the awesome Sackhoff (Oculus, Riddick, Battlestar Galactica), Lucy Boynton (Sing Street), and Nick Moran (Lock Stock and Two Smoking Gun Barrels, Harry Potter and the Deathly Hallows). Synopsis: “Knock once to wake her from her bed, twice to raise her from the dead…” So goes a disturbing urban legend involving an abandoned house supposedly inhabited by a vengeful, child-stealing witch.