Jeremy Renner and Gemma Arterton are Hansel and Gretel, all grown up and now they hunt witches in the late 1700s? Early 1800s? I'm not sure, All of the clothing and architecture is around the turn of the 18th century but Hansel uses a pump action shotgun, and a one point someone shoots a 50cal Gatling gun.
Oh and Hansel has steam punk Diabetes.