McGurk Mysteries

The Case of the Invisible Dog by E. W. Hildick, 1977.

The members of the McGurk Organization are having their annual picnic in McGurk’s backyard when, suddenly, a doughnut leaps off the table and begins traveling through the bushes and grass. None of them can understand what’s happening because they can’t see anything that would cause the doughnut to move like that.

They go after the doughnut to see what happened, and they find Brains Bellingham, the nephew of Miss Bellingham, who lives next door. Brains has been staying with his aunt while his parents are out of town, and he always has a put-down for the members of the McGurk Organization. Brains is holding his aunt’s Yorkshire terrier, Dennis, and the missing doughnut, which has apparently been chewed by the dog. Brains apologizes for the dog ruining their “crummy” picnic, but he says that Dennis can’t resist doughnuts. However, that explanation doesn’t satisfy the McGurk Organization because none of them saw a dog carrying the doughnut, just the doughnut moving by itself. Brains makes an excuse about the dog being small and blending in with his surroundings, but the others can tell that he’s hiding something.

When Brains leaves for a moment because he says his aunt is calling him, they spot a strange black box in the grass. The box has dials and switches on it, and there are two labels: “Increase Invisibility” and “Restore Visibility.” Brains is known for building various inventions, so they know this is probably something he made, but does this device really make things invisible? Is that why they couldn’t see the dog when he stole the doughnut? They have a look inside the device, but since none of them is particularly good with electronics, they just know that it contains a bunch of wires and seems to be powered by batteries, and there is some kind of light inside the box. There are also doughnut crumbs inside the box.

When Brains sees them messing with the box, he yells at them to stop snooping. Joey, the organization’s secretary, knows that part of Brains’s problem with the organization is that he’s jealous because he really wants to join. He’s hinted before that they need a laboratory man to help them with forensics. McGurk might have taken him up on the offer except that Brains was condescending and insulting in the way he made it, calling them “dummies.” He’s a little younger than the rest of them, too, so his condescending attitude makes him seem even more like an annoying little kid. McGurk tries to ask Brains about his strange device, but Brains just refuses to answer and takes the box and the dog away.

The members of the McGurk Organization return to their picnic, but they can’t stop wondering about Brains, his strange invisibility device, and how he accomplished the trick with the dog and the doughnut. Most of the organization members are pretty sure that there must be some kind of trick to it, but they can’t figure out how Brains did it. While they discuss it in their basement meeting room, they hear what sounds like the jingle of dog tags, and Willie, who has a very sensitive nose, says that he smells a dog. They search the basement and find a dog’s rubber bone. Then, Brains shows up, looking for Dennis. To their astonishment, Brains seems to pick up an invisible dog, who seems to be struggling and making dog noises, growling and jingling tags!

When the organization goes to confront Brains about what just happened, they find him with his strange box. The box appears empty on the inside, but they hear dog sounds from it. Brains operates the controls and opens the box again, and Dennis comes out! Brains claims that he invented the invisibility box by accident while he was trying to develop a treatment for getting rid of Dennis’s fleas and ticks using light rays. Brains says that there is a side effect where Dennis sometimes turns invisible at random times without Brains intentionally turning him invisible but that he’s working on the problem.

McGurk is thrilled at the possibility that Brains might be able to build a machine big enough to turn a person invisible, and he even offers Brains membership in the organization if he can do it. Brains says he could, but to everyone’s surprise, he turns down the membership offer. He says that he knows they don’t really want him in the organization; they just want his machine. It’s a little embarrassing, but it’s true.

The members of the McGurk organization consider ways that they could get Brains to change his mind. McGurk considers blackmail, but Wanda says that wouldn’t be right for a detective organization. Wanda thinks McGurk should apologize to Brains for the way he turned Brains away when he tried to join earlier, but McGurk can’t stand the idea of apologizing. Willie thinks they could offer to pay Brains, but they don’t really have anything they could pay him. They all ponder what would happen if they let word of Brains’s invention get out to the public or even the government.

Then, Brains comes to them, asking for help. He says that Dennis has turned invisible again, and he’s run off! Can the McGurk Organization find an invisible missing dog?

The book is available to borrow and read for free online through Internet Archive (multiple copies).

My Reaction

I didn’t read this book when I was a kid, although I read many others in the series. Because I didn’t read this book before, I didn’t really know the story of how Brains joined the McGurk Organization. There are some references to it in some of the later books in the series, so I knew that, when the other members of the organization first met Brains, they were investigating him for some trick he’d played on them. I was used to Brains being their friend, so it seemed odd to see him as the antagonist/suspect they are investigating in this book.

During the story, the members of the McGurk Organization are pretty sure from the beginning that Brains is playing some kind of trick, but they’re not sure how. He does manage to convince them temporarily that he has successfully developed an invisibility device, but McGurk soon realizes that something Brains has said contradicts what’s happened. Then, he and the others reexamine what happened to figure out how Brains staged his tricks. They’re a little mad at being tricked, so they pull one more trick on Brains to get even before they all forgive each other. Brains shouldn’t have called the others “dummies” or been condescending to them, and the others shouldn’t have been too quick to write him off just because he’s a year younger than they are. In the end, McGurk says that anybody who’s clever enough to work out a complicated trick like this one deserves to be a member of the organization, and they hold another picnic to celebrate their new member.