No Time for Love — Barbara Cartland

Larina Wilton finds out that she has a month to live, and she decided contacted by her dead friend's brother, who was in Italy.

Although he had dedicated much of his life to the pursuit of women, Wynstan Vanderfeld was unprepared for his first sight of Larina Wilton in the temple of Aphrodite. Half convinced that she is an adventuress intent on making capital from her friendship with his dead brother, the wealthy American is unaware that Larina fears she will die in 21 days.

Larina never dreamed such exquisite rapture could be hers. To have fallen in love with so strong, so handsome a man--and to have that love returned. It was unbelievable! But as magical as it was, their love was utterly hopeless. Larina alone knew why. It was the secret she would keep at any cost.