The Cat-Fed Neighborhood
The Mystery of The Invisible DogAlex Hassell’s fixed feeding routine first marks him as a suspect and ultimately supplies the timing clue that helps clear him.
increasing
Bearing strength in each event
decreasing
The Cat Man

The Cat Man
A conspicuous routine
Fenton Prentice describes Alex Hassell as a man who feeds stray cats and keeps one as a pet. Hassell’s independent schedule makes him difficult to place.
A possible suspect
The routine gives him access to the courtyard and makes his movements visible. In a building full of possible offenders, even a harmless habit attracts scrutiny.
Dinner at Five

Dinner at Five
A neighborhood ritual
Cats gather at Hassell’s door, and he brings out food. His regular care gives the courtyard a predictable daily rhythm.
A clue in plain routine
The boys learn that Hassell leaves or returns around a fixed time to feed them. This schedule will later test whether he could collect the ransom at five.
A Threat to the Cats

A Threat to the Cats
Fear drives a departure
After poisoning, an explosive car, and a fire, Hassell leaves for a motel with his cat. He refuses to remain in a building he considers unsafe.
Suspicion shifts
His departure removes one potential suspect from the courtyard but does not prove innocence. His continued plan to return at five preserves the importance of his routine.
The Five O’Clock Test

The Five O’Clock Test
A schedule collides with a demand
The burglar orders a collection at five, the time Hassell feeds the cats. Jupiter Jones recognizes that Hassell would risk exposing himself by abandoning the animals then.
Exclusion by routine
The clue does not rely on a dramatic confession. A small, consistent obligation helps eliminate Hassell from the shortlist.
Return to the Cats

Return to the Cats
A caretaking routine persists
Hassell says he will come back to feed the cats even while staying elsewhere. His concern for them continues amid the building’s disorder.
Ordinary kindness amid crime
The detail distinguishes a neighbor’s eccentric care from Murphy’s calculated harm. The cats’ routine becomes both a clue and a measure of Hassell’s character.
The first day the tenants are discussed
Late afternoon during the courtyard watch
After Murphy’s fire
When the ransom letter is read
After Hassell leaves for the motel