Yaga: chicken bones? Saltburn parties? This folk horror is so debauched, it’s hilarious

Heated Rivalry’s Hudson Williams and Carrie-Anne Moss star in this audacious mystery about a Slavic witch. There’s supernatural weirdness, detective work … and a hero who looks a lot like Tim Key dressed in leatherHalloween was once a simpler time, when neighbourhood kids would dress up as mythical serial killers, the undead or bedsheet-wearing ghosts. At some point, following America’s…