Overview
Break of Hearts is a 1935 RKO film starring Katharine Hepburn and Charles Boyer. The screenplay was written by the team of Sarah Y. Mason and Victor Heerman, with Anthony Veiller, from a story by Lester Cohen, specifically for Hepburn.
Originally Break of Hearts was intended as a vehicle for Hepburn and John Barrymore. The film was promoted by RKO's advertising department with the catch phrase: "The star of a million moods together with the new idol of the screen." (Francis Lederer actually was first signed-up lead, but the producers replaced him with Charles Boyer.)
Plot summary
Franz Roberti (Charles Boyer) is a passionate and eminent musical conductor; Constance Dane (Katharine Hepburn) is an aspiring but unknown composer. She wants to see his concert, but it is all sold out. When she sneaks into his rehearsal he is smitten by her devotion and gets his orchestra to get it right as they play just for her. Constance marries Franz: he says she is "a most exciting creature" and she has been in love with him for a long time (i.e., "since late this afternoon").
From Wikipedia (CC BY-SA 4.0).