Colin, a successful businessman in the property and stock markets in the south of England, has his life firmly under control. But one day, out of the blue, his older sister Abigail – who finds herself in serious trouble following the death of her much older, aristocratic and heavily indebted husband – turns up at his door after twenty years and asks for his help. Out of loyalty, he takes her in. To secure her position, she will stop at nothing, not even seducing her own brother. Her desire to have him all to herself becomes an obsession. And Colin increasingly succumbs to the spell of this femme fatale, who is as seductive as she is cunning. Yet the relationship, which violates social taboos, cannot remain unnoticed by the outside world forever and has no future …