The dashing Robert Carr is a well-known favorite of King James I. After attracting his attention by falling from a horse in the tiltyard, Robert rises quickly through the ranks. But when the cunning and beautiful Frances Howard comes to court, a very dangerous liaison changes everything.

Married against her will while still a child, Frances emerges from that experience a headstrong force of nature-determined to have her own way, no matter what the consequences. Her attempts to rid herself of an unwanted husband, and later to ensnare a lukewarm lover, have led her deep into the world of spell-makers and poisoners. This is a woman to underestimate at great peril. But not until Robert finds himself ensnared in one of Frances’s plots-imprisoned in the Tower of London and accused of murder-does he learn at last what she is truly capable of.