An incomparable beauty. A promise to a king. A portrait that can never be completed.

When Emilia Lennox loses everything after her husband's lands and title are confiscated, her beauty is her best bargaining chip with the only man who can restore their fortunes: King Charles II himself.

But the king's favour comes at a price. He will pardon Emilia's husband only if she agrees to be his mistress. Torn, Emilia comes up with a condition of her own: she will consent, but not until her portrait hangs among the famed Windsor Beauties, a series commissioned by the Duchess of York to showcase the fairest women in the royal retinue.

For Henry Greenhill, ambitious assistant to the court painter, the opportunity to paint Emilia's portrait is a chance to step out of his master's shadow. But his sitter proves as evasive as she is beautiful, and with barely a sketch to show for his efforts, Henry's career is on the line.

As the king's patience wears thin, it's clear that more than creative talent will be needed to capture this incomparable beauty on canvas ...