The Household’s Changing Allegiances
Towards ZeroAs the murder inquiry shifts, the residents revise whom they trust and what they believe about the marriages around them.
increasing
Bearing strength in each event
decreasing
Mary Questions the Reunion

An Uncharacteristic Proposal
Mary senses a mismatch
Mary finds Nevile’s plan to bring both wives together unlike his usual behaviour. She wonders whether Audrey or someone else proposed it, even as Lady Tressilian assumes Kay is responsible.
Mary’s uncertainty shows that she knows the people involved but cannot confidently interpret their motives.
A gathering accepted
When Audrey says she wants to come, Mary supports the plan rather than insisting on her own suspicion. Her desire to understand the arrangement later becomes part of her role as witness.
Thomas Protects Audrey Quietly

Loyalty Without Display
A watchful relation
Thomas observes Kay’s hostility and Audrey’s detachment, then offers Audrey companionship without forcing her to explain herself. His quiet presence differs from Nevile’s intrusive efforts to define what she should feel.
He loves Audrey but recognizes that her situation is difficult. His concern is genuine even when he does not understand the source of her fear.
A divided understanding
Thomas assumes Nevile may be a fool rather than a threat. Like the other people in the house, he has not yet understood the danger Audrey senses.
Mary Gives Battle a Warning

A Confidence Shared
Treves’s story recalled
Mary tells Battle that Treves’s child-murder story may have been directed at someone in the room. She also explains that the hotel lift notice preceded his death.
She is uneasy about speaking but trusts Battle with the information. Her account links a guest’s death to the household’s hidden history.
Trust becomes consequential
Mary’s willingness to disclose her suspicion gives Battle a new line of inquiry. Her role shifts from caretaker and observer to an active contributor in the investigation.
Thomas Corrects the Marriage Story

The Past Made Public
A truth finally stated
Thomas tells Battle and Nevile that Audrey left Nevile for Adrian. Nevile had accepted blame and protected her from public exposure.
The revelation changes how the others understand Audrey’s presence, Nevile’s generosity, and the supposed revenge motive.
Loyalty tested
Nevile’s chivalry is real, but it does not make him innocent of the later crime. Thomas risks exposing private history because the false public story could help send Audrey to prison.
Companionship After Crisis

Relationships Reconsidered
Audrey chooses her own direction
Audrey accepts MacWhirter’s proposal to travel with him rather than return to the role of Nevile’s former wife or Thomas’s long-awaited love. Her choice changes the emotional arrangements of the household.
Thomas’s devotion remains respected, but Audrey recognizes a possible connection between him and Mary.
A new household of the future
The survivors leave the crisis with relationships redefined rather than neatly restored. The novel closes with affection redirected toward lives not built around Nevile’s control.
April, after receiving Nevile’s letter
Early September, after the terrace confrontation
September 13, after the household is questioned
September 13, during the arrest of Audrey
After Nevile’s confession