Why isn’t there a Second Wives Club? Tasha, the heroine of a new British thriller, The Ex-Wife, could certainly use some support from other young women married to wealthy older men with intrusive first wives. Instead, after a whirlwind romance with a handsome media mogul named Jack, Tasha finds herself all alone with a new baby in a big, empty house. Her main distraction is Jack’s ex-wife, Jen, a glamorous decorator who seems to be remarkably close to Jack and his family, and keeps showing up. The Ex-Wife has hints of Daphne du Maurier’s Rebecca, but not in the way you’d think. This gripping four-episode series on BritBox has twists all its own. —Alessandra Stanley