Our Wives Under the Sea by Julia Armfield; 2022. Hardcover.

Leah is changed. A marine biologist, she left for a routine expedition months earlier, only this time her submarine sank to the sea floor. When she finally surfaces and returns home, her wife, Miri, knows that something is wrong. Barely eating and lost in her thoughts, Leah rotates between rooms in their apartment, running the taps morning and night. Whatever happened in that vessel, whatever it was the crew was supposed to be studying before they were stranded, Leah has carried part of it with her, onto dry land and into their home. As Miri searches for answers, desperate to understand what happened below the water, she must face the possibility that the woman she loves is slipping from her grasp.