Marco Adamos is an unmarried, 40-year-old theoretical physicist whose career is at a crossroads. After a year of dead-end research in New Mexico, he returns to Chicago and cajoles a friend, Frank Douglas, to go sailing on Lake Michigan.

While cutting through unusually choppy waters, Marco and Frank encounter another sailboat, Blind Faith, piloted by two men dressed in black robes with pointed hats. But it’s the beautiful woman accompanying them who captivates Marco. Across the waves, their eyes meet in a fleeting but astonishingly intimate embrace before the boats sail out of sight. Back on shore, Marco is obsessed with finding her again.

The pursuit leads Marco to unexpectedly dark places, including a brush with the occult when he is captured by a sadistic witch’s coven. To escape, Marco must rely on luck and his physical prowess. But to find love and save his career, he needs to call upon his scientific intellect, not the blind faith of his captors.