We who are members of the single classes, unmarried and unattached, are always waiting to fall in love...Every day and each encounter holds out the possibility of that momentous flash which will change everything.

Constance Liddell, in her mid-forties, answers a personal column ad - "Polish gentleman, 50s, political refugee, seeks intellectual woman for marriage" - and arranges to meet Iwo Zaluski. For Constance, her work, children, friends and friendship with her charming, philandering ex-husband only sometimes alleviate the deeper longing for intimacy and marriage. Meeting Iwo Zaluski for the first time, on a walk on Hampstead Heath, she perceives in him the loneliness of a fellow exile. Too rapidly, she falls in love.