Chiwetel Ejiofor’s directorial debut hits Netflix. And a new action series, “The Widow,” is streaming on Amazon.

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THE BOY WHO HARNESSED THE WIND (2018) Stream on Netflix. Here’s one of the many lessons that can be gleaned from Chiwetel Ejiofor’s directorial debut: A library can transform a person’s life. This was the case for William Kamkwamba, the Malawian innovator at the center of this movie. As a teenager, Kamkwamba helped save his village from drought by building a power-generating windmill. When Kamkwamba (played by Maxwell Simba) isn’t allowed to go to school anymore because his parents (Ejiofor and Aïssa Maïga) can’t pay tuition, he sneaks in. When he can’t do that anymore, he teaches himself from library books. One of them gives him the idea to build the windmill. Ejiofor, who was nominated for an Oscar for his role in “12 Years a Slave,” takes his time building the story out, turning the film into as much an exploration of life in this Malawi village in the early 2000s as a story of Kamkwamba’s ultimate triumph.