Blurb from goodreads.com:
Chantal was brought up lovingly by her stepmother, Mavreen. Exquisite and beguiling, she is loved by three men: a debauched French nobleman; a bold, hot-blooded Portuguese pirate; and John, Mavreen's son. Chantal knows him only as a brother – but he is aware of the truth and will risk anything to win her love. From the glittering ballrooms of aristocratic London, to a French château and a deserted tropical island, Chantal is swept into a whirlwind of ecstasy, scandal and anguish. This unforgettable saga pulses with the same passion and energy as the story of Mavreen, Chantal's stepmother and her 'sister' Tamarisk.

Blurb from fictiondb.com:
LOVE BEYOND THE BOLDEST DREAM. ADVENTURE SURPASSING THE WILDEST FANTASY.

Torn from the dazzling salons and glittering balls of aristocratic London, the beautiful, beguiling Chantal is cast adrift on the stormy sea of destiny. From an evil chateau and a debauched French nobleman to a deserted tropical island and a bold Portuguese pirate to an elegant English estate and a dashing officer, Chantal is swept up in a tempestuous whirlwind of passion and scandal, anguish and ecstasy.

This unforgettable saga of triumphant love and soaring dreams pulses with the vivid legacy Chantal's stepmother, the incomparable Mavreen, and Mavreen's children, the bewitching and untameable Tamarisk, and John, who is aware of the truth of their kinship and will risk anything to win her love.

512 pages

The Women of Fire Trilogy:

Book 1 - Mavreen (1976)
Book 2 - Tamarisk (1978)
Book 3 - Chantal (1980)