Paul Lukas plays a nightclub headwaiter who rises to fame as a bridge expert. He marries hat check girl Loretta Young, likewise a card fanatic. Lukas and Young find themselves vying for the national bridge championship, which results in the expected frictions. All is forgiven in the climactic scenes, in which silver-tongued radio commentator Roscoe Karns gives a play-by-play of the "big game" while director William Dieterle uses freeze frames and slow motion to beef up the tension. Grand Slam is quite an eye-opener for fans of Loretta Young, who displays an unusually generous amount of thigh in her nightclub outfit.