Modus (2016)

Out of his depth and desperate, Sammy, a hapless teacher who owes a loan shark more than he can afford, digs a shallow grave in dark open fields to hide a victim of mistaken identity. Of all the space available, he chooses to dig in just the spot that causes him to inadvertently uncovers someone else's shallow grave. Before he can do more, that someone else, a deadly hit-woman, Mercedes, is standing right behind him at the grave's edge. As the details of Sammy's predicament, and what led to him burying a body at all, unravel, Mercedes makes a connection between him and her occupation. Sammy was her next call.