Fenton Prentice’s Fear
The Mystery of The Invisible DogFenton Prentice moves from private fear and isolation toward relief, while learning that a practical solution to one intrusion cannot explain every strange sight.
increasing
Bearing strength in each event
decreasing
The Private Collector

The Private Collector
A guarded life
Fenton Prentice lives among treasured art and values his privacy. When he describes a shadow entering his apartment, he sounds frightened but uncertain of being believed.
Asking for help
He summons the Three Investigators rather than the police. The choice reveals both his isolation and his need for someone to take his experience seriously.
A Human Explanation

A Human Explanation
The intrusion identified
Jupiter Jones proves that Mrs Bortz has used a key to snoop in the apartment. Prentice takes the key and confronts the manager privately.
Relief and self-doubt
Prentice believes he may have imagined the shadow. His relief is genuine, but his quick conclusion underestimates the evidence that the boys have also seen.
A Return of Fear

A Return of Fear
Another appearance
The shadow seems to return while Prentice is in his den. Jupiter Jones sees it too, restoring Prentice’s confidence that his distress is not merely imagination.
A fresh dependence
Prentice asks the boys to stay overnight. His fear makes him vulnerable, but the investigators’ presence also gives him a measure of security.
The Sculpture at Risk

The Sculpture at Risk
Attachment to the Hound
Prentice watches Jupiter Jones retrieve the Carpathian Hound from the pool. He fears that the delicate sculpture may be chipped or broken if used as bait.
Trust under pressure
He agrees to return it to the water, putting the case ahead of his wish to protect the artwork. The decision reflects growing trust in the boys.
Peace After the Case

Peace After the Case
A quieter home
Sonny Elmquist and Mrs Bortz leave the building, and Prentice reports that his apartment is peaceful. He no longer lives under constant suspicion of intrusion.
What remains unresolved
The phantom priest has no definitive explanation. Prentice’s relief coexists with the story’s acknowledgment that not every disturbing experience receives a certain answer.
Late afternoon during Christmas week
The afternoon the ointment test succeeds
The evening after Mrs Bortz’s exposure
The afternoon the Hound is recovered
Two weeks after the arrest