The scientist and spy Theodore Hall is profiled in this warm, low-key documentary.

The subject of the absorbing documentary “A Compassionate Spy” might be the brilliant atomic physicist Theodore Alvin Hall, but its star is his nonagenarian widow, Joan. Funny, candid and eager to share, this delightful woman — and her unwavering support for her husband’s espionage during World War II — sets the tone for a film that leaves no doubt as to the location of its sympathies.

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