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The Investigators Take the Haunting Case

The Mystery of The Invisible Dog

Jupiter Jones, Pete Crenshaw, and Bob Andrews move from a baffling report of a haunting to a wider investigation that exposes several connected crimes.

increasingupBearing stren­gth in each eventdowndecreasing
The SummonsThe Summons from "The Mystery of The Invisible Dog". The Summons An unusual client Fenton Prentice asks the Three Investigators to investigate a presence that seems to enter his locked apartment.
The Summons An unusual client Fenton Prentice asks the Three Investigators to investigate a presence that seems to enter his locked apartment. He fears that the police will dismiss his account. A cautious commitment Jupiter Jones questions the story but recognizes that a real intruder may be exploiting Prentice’s fear. The boys agree to look for evidence.
The Marked DrawersThe Marked Drawers from "The Mystery of The Invisible Dog". The Marked Drawers A practical test Jupiter Jones coats the desk handles with Investigative ointment, designed to reveal anyone who touches them.
The Marked Drawers A practical test Jupiter Jones coats the desk handles with Investigative ointment, designed to reveal anyone who touches them. The experiment turns a supernatural-sounding problem into a physical test. A human intruder The smeared handles show that someone opened the desk while the boys were away. The evidence establishes that at least one visitor has ordinary, solid hands.
The Shadow ReturnsThe Shadow Returns from "The Mystery of The Invisible Dog". The Shadow Returns A renewed disturbance After Mrs Bortz admits to entering Prentice’s apartment, Prentice sees another shadowy presence.
The Shadow Returns A renewed disturbance After Mrs Bortz admits to entering Prentice’s apartment, Prentice sees another shadowy presence. Jupiter Jones recognizes a resemblance to Sonny Elmquist but cannot explain how he could enter. The puzzle expands The boys search for a secret passage and find none. The haunting now appears connected to a second, unexplained kind of intrusion.
Three MysteriesThree Mysteries from "The Mystery of The Invisible Dog". Three Mysteries A case takes shape Back at The Three Investigators’ Headquarters, Jupiter Jones separates the shadow, the stolen sculpture, and the phantom…
Three Mysteries A case takes shape Back at The Three Investigators’ Headquarters, Jupiter Jones separates the shadow, the stolen sculpture, and the phantom priest into distinct questions. Their possible links give the case its structure. A working theory The boys suspect a local offender who knows the neighborhood and the church. Yet Sonny Elmquist’s apparent appearances while asleep prevent an easy conclusion.
The Case ClosesThe Case Closes from "The Mystery of The Invisible Dog". The Case Closes The culprit identified Jupiter Jones explains how John Murphy stole the Carpathian Hound, hid it in the pool, and tried to obtain ransom money.
The Case Closes The culprit identified Jupiter Jones explains how John Murphy stole the Carpathian Hound, hid it in the pool, and tried to obtain ransom money. Police arrest Murphy after the failed handoff. An imperfect resolution The theft and the attacks are explained, but the phantom priest remains uncertain. The boys leave that last question open rather than claim a proof they do not possess.
Late afternoon during Christmas week
The morning after the first visit
The evening after Mrs Bortz is exposed
The morning after the church incident
Mid-January