Eugene Gologursky/Getty ImagesWay back in 2014, my sister sent me a familiar text: "Have you seen this show?" We don't live close enough to watch TV together, so we instead put each other onto things we can just obsess over on the phone. A link soon followed for When Calls the Heart — a Hallmark period drama set in the early 1900s about a wealthy young teacher who leaves her comfortable city life to lead a school in a coal-mining town called Hope Valley. If you'd asked me a decade ago whether I'd still be invested in the show today, I would not have guessed yes. But my sister obviously sensed...

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