Life for Louisa June is changing in big swells, like storm currents in her tidewater Virginia. Days after Japan’s attack on Pearl Harbor in 1941, Hitler declared war on the US, unleashing U-boat subs to attack American ships. Suddenly, the waves outside Louisa June’s farm aren’t for fishing or watching wild swans or sculling her family’s boat–they’re dangerous, swarming with hidden enemies. Her oldest brothers’ ships risk U-boats’ torpedo hits. her sister leaves home to weld Liberty boats. And then her daddy, a tugboat captain, and dearest brother, Butler, are caught in the crossfire. Her mama has always swum in a sea of melancholy, but now she really needs Louisa June to find moments of beauty to buoy her. Determined to help her mama, and aching to combat Nazis herself, Louisa June turns to her quirky friend Emmett and the indomitable Cousin Belle, who has her own war stories–and a herd of cats–to share. In the end, after a perilous sail, Louisa June learns the greatest lifeline is love.