The title is as plain as the film itself. Sisu – which in Finnish means tenacity, especially in the face of despair – promises a bare-bones thriller based on bare-knuckle action and delivers in the full. Jalmari Helander’s English-language movie is set during World War II, a time of nasty Nazis, a battle-ravaged land, and at least one money-minded Finn. Aatami (Jorma Tommila) has found a stash of gold that he is determined to protect his bounty at any costs. So what if a Nazi battalion is on his trail? Aatami – part Boris the Blade and part John Wick...