Prentice and Mrs Bortz
The Mystery of The Invisible DogThe relationship between a privacy-loving tenant and an intrusive manager develops from antagonism into exposure and finally separation.
increasing
Bearing strength in each event
decreasing
Mutual Dislike

Mutual Dislike
A hostile first meeting
Mrs Bortz tries to dismiss the boys as peddlers, while Fenton Prentice openly calls her nosy. Neither conceals contempt for the other.
A conflict of privacy
Prentice wants control over his home; Mrs Bortz treats tenants’ lives as material for observation. Their disagreement is about boundaries as much as personality.
The Hidden Key

The Hidden Key
Authority abused
While Prentice is in Europe, Mrs Bortz persuades a locksmith to make a key to his special lock. She violates a lease clause that forbids her entry.
Suspicion made physical
Her access explains the disturbed desk and papers. The manager’s respectable role has become a cover for an intrusion into a tenant’s private life.
The Black Stains

The Black Stains
Exposure in the courtyard
Jupiter Jones confronts Mrs Bortz after discovering marks from the Investigative ointment on her hands. Prentice recognizes the proof and summons her inside.
A private reckoning
Prentice avoids turning the confrontation into a spectacle, but he makes clear that legal action is possible. Their tense relationship shifts from suspicion to accountability.
The Car Bomb

The Car Bomb
A frightened manager
An explosive device sends Mrs Bortz’s car into a hydrant. She claims someone shot at her and is too shocked to explain more.
A change in vulnerability
The habitual observer becomes a victim whose private safety has failed. Her earlier intrusion does not make the attack against her less serious.
Departure from Paseo Place

Departure from Paseo Place
Leaving the building
Mrs Bortz departs for her sister’s home after the attacks and chaos. Later she says the neighborhood has become too dangerous for her.
An uneasy resolution
Her departure ends the direct conflict with Prentice, but the case has not made her intrusion acceptable. The building loses a controlling manager along with a source of surveillance.
Late afternoon during Christmas week
Two months before the investigation
The day the desk is tested
Before dawn the following morning
The morning after the car explosion