Rachel Weisz turns in her most feeling performance yet in Terence Davies’ “The Deep Blue Sea,” an exceedingly simple yet powerfully poignant postwar story of romantic love so intense and obsessive it becomes the undoing of an intelligent and well-provided-for woman. Weisz’s Hester Collyer is the wife of a respected judge (Simon Russell Beale), but passion has escaped the marriage; he’s sober and undemonstrative, she’s headstrong and ahead of her time, and in need of an outlet for her pent-up sexuality. When that outlet arrives in the form of Freddie, a handsome young RAF pilot (Tom Hiddleston), and their affair is inevitably discovered, Hester leaves her uncomprehending husband, explaining without any cruelty that her love for this new man encompasses nothing less than the whole of her. As her world narrows down to him, though, Freddie begins to suffocate, turning to drink and nights out with friends to escape.
