On the Argyll estate, heiress Rachel Argyll is found murdered. Eighteen months have passed since the tragedy, and as her widower makes plans for a new marriage, questions arise regarding the killer's identity.

Calgary is resolute in her quest to demonstrate Jack's innocence, yet his very alibi casts him into a precarious and self-made peril.

The preceding circumstances that culminated in Rachel’s death are now laid bare, and the identity of her murderer is at last revealed.