Valerie “Val” Chesterfield is a linguist trained in the most esoteric of disciplines: dead Nordic languages. Despite her successful career, she leads a sheltered life and languishes in the shadow of her twin brother, Andy, an accomplished climate scientist stationed on a remote island off Greenland’s barren coast. But Andy is gone: a victim of suicide, having willfully ventured unprotected into 50 degree below zero weather. Val is inconsolable—and...