The Last Letter from Your Lover (2021)

A present-day journalist doing research stumbles across a misfiled love letter that piques her interest. With the help of a smitten archive clerk, she locates more and begins to piece together who the people are and what became of them. At the same time, we follow the letters' writer and subject in the '60s, when they were falling in love.

If either of the couples had a spark of heat between them, it would've helped immensely. As written, though, it's a couple of tepid affairs in different worlds and times.

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