Leonard Bernstein (Bradley Cooper), composer, conductor, and complicated man, meets actress Felicia Montealegre (Carey Mulligan) at a party in 1946.
The whirlwind romance that ensues as Bernstein's renown skyrockets develops into a complex, lifelong partnership – through two engagements, a 25-year marriage, and three children – that sees both halves enduring the pressure and fallout of ambition, commitment, fame and love.