Free in Deed

Mahaffy’s uncompromising approach, and the quality of its performances, make it a rare and valuable testament: to the terrible danger of believing in miracles, and to the cruelty of a world that might make such belief necessary.

David Harewood and Edwina Findley, the only trained actors in a compelling cast of non-pros, deliver harrowing performances as a self-styled healer and the desperate mother who seeks his help for her tormented son.

Superb, skin-prickling performances by the three principals contribute invaluably to the pic’s stern believability, with Findley utterly wrenching as a dedicated mother pushed to frank irrationality by others’ neglicence.

The fact-based story, which is allowed to quietly unfold in a series of extended takes, has been stripped of all artifice, especially in regard to the pared-back performances of Harewood, a British actor with regular roles on “Homeland” and “Supergirl,” and Findley, who starred in Ava DuVernay’s 2012 breakthrough feature, “Middle of Nowhere.”

Each time the movie edges into mannerism Mr. Harewood and Ms. Dickerson pull you close enough to make it hurt.