A possible solution arrives in the form of the imperious American heiress Annabel Clarke. The Earl and Countess of Avebury are determined that Cecilia's brother, Patrick, will win Annabel's hand in marriage - and her fortune along with it. To help the lackluster Patrick in this pursuit, the Bates and their staff arrange a grand house party upon the heiress's arrival. When a guest dies after sipping from a glass meant for Annabel, it's clear the Bates have a more poisonous problem on their hands. As the scandal seizes Danby, Cecilia sets out to find the culprit, with help from Annabel's maid, Jane, and Jane's curiously intelligent.
