Mar 19 Mar 19 Film Review: Knife + Heart (2018), dir. Yann Gonzalez Guest User Reviews, Culture ‘Knife + Heart’ is a romance sliced up in a gritty synth pop slasher. I shielded my eyes, I chuckled, and I wiped away tears. Sometimes, it’s true what Nazareth sang, “love is like a flame, it burns you when it’s hot.”