Theo Grant and Harper Lily Ellis-Grant had been married three years when their life found its perfect rhythm—on the ice, in the bedroom, and in the quiet spaces between.

At twenty-nine, Harper was in her prime with the Boston Fleet: captain, two championships, a leader who played with the same fire her mother Rowie had, but with her own spin—a wicked one-timer and a laugh that carried across the rink.

Theo, thirty-one, was a rising orthopedic surgeon specializing in sports ...