Based on a novel by Francoise Sagan, A Certain Smile was a vehicle for Darryl F. Zanuck's latest protegee, Christine Carere. Parisian student Carere spats with her boyfriend Bradford Dillman, then impulsively agrees to accompany Dillman's worldly uncle Rossano Brazzi to the Riviera. At first thrilled at the prospect of an affair with the dashing Brazzi, Carere is disillusioned to discover that she is the latest in a long line of "diversions" for the old charmer. After a heart-to-heart with Brazzi's patient wife (Joan Fontaine), Christine returns to her boyfriend. The title song for A Certain Smile became a hit for Johnny Mathis, who sings the tune over the film's opening credits.
~ Hal Erickson, All Movie Guide