“I don’t know.”
“Something that hops, and balances with its tail.”
“A—you mean a—kangaroo?”
Roger chuckled, nodding.
“But why did they go to all that trouble, when a man could of swarmed down a rope, and got the rats?”
“If he’d got caught—not knowing everything about the inside of our lab, maybe,” Roger responded, “He’d go to jail. But if we got a kangaroo, or an ape, the animal trainer could know it and have an ad. in next day’s papers, get back his animal that couldn’t tell what it was there for, and——”
“Well, what was it here for? What made all that compulsatory?”
“The motive made it compulsory, Tip.”
“You didn’t tell me about any motive. Or how all this wire and stuff will catch anything when we don’t know anything will come tonight, like you hint at.”
“The motive, Cousin Grover thinks, is to get into our safe, for our data and formula for synthetic camphor.”