Eighteen-year-old Mistral is an innocent abroad in the sophisticated Côte D'Azur, where princes and millionaires mingle in the casinos and sumptuous hotels while others plot to relieve them of their riches.
Accompanied only by her embittered and domineering Aunt Emilie and kindly servant Jeanne, Mistral appears dressed all in grey like a ghost in the salons and ballrooms of Monte Carlo and sets Society's tongues wagging. It's not long before her waif-like beauty has men falling at the feet of Madamoiselle Fântóme – gentlemen such as Sir Robert Stanford.
But on her sister's bewildering but strict instructions, she must not converse with any but the Russian Prince Nikolai, who's also keen to woo her, as is an opulent Indian Rajah...
Something about Mistral touches Sir Robert's heart – and he cannot understand why Mistral appears afraid to be with him. Yet both of them crave love. Only if Mistral's innocent eyes are finally opened to the truth – that Aunt Emilie's motives are borne not of concern for her niece but of pure evil and greed – will she find her heart's desire...