“Let’s have another look at this,” he suggested.
All three read the letter again. It seemed as innocent as before.
State Prison Hospital July 17 Dear Gulliver:
Just a few words from your old pal and cellmate, Spike Neely. I’min the hospital, and it looks like I haven’t got much longer.
I may last five days or three weeks, or even two months, the doctorsaren’t sure. But in any case, it’s time to say good-bye.
If you’re ever in Chicago, look up my cousin Danny Street. Tellhim hello for me. Wish I could say more, but this is all I canmanage.
Your friend,
Spike
“If there’s a hidden clue there, I can’t find it,” Jupiter muttered. “I wonder if — Wait! I’ve found something. Look!”
He held out the letter and the envelope to Bob. “Do you see what we missed?”
“What we missed?” Bob looked puzzled. “No, I don’t see anything special, Jupe.”
“The stamps on the envelope!” Jupe said. “We didn’t look under thestamps for a message!”
Bob looked at the two stamps — a two-cent stamp and a four-cent stamp. He took the envelope and ran his finger over them. His expression changed to one of great excitement.
“Jupe!” he exclaimed. “You’re right! There’s something under one of these stamps. The four-cent stamp feels just a little bit thicker than the two.”
Pete also ran his finger over the stamps and nodded.
The four-cent stamp was just a trifle thicker — not enough for the eye to notice unless you looked very closely.
“Let’s get inside Headquarters and steam these stamps off and see what’s underneath!” Bob exclaimed.
They scrambled back through Tunnel Two and within three minutes had a little kettle boiling in the laboratory. Jupiter held the corner of the envelope in the steam until the stamps loosened. Then he gave a shout of excitement.
“Look!” he cried. “There’s another stamp underneath the four. A green one-cent.”
“That’s queer.” Bob frowned. “What does it mean, Jupe?”
“I can tell you what it means,” Pete said. “There’s nothing mysterious about it. Don’t you remember that back about the time this letter was mailed, the postage rates went up by a cent? Spike Neely probably put a one-cent stamp on then realized that wouldn’t be enough so he pasted on a two, then put the four-cent stamp on top of the one.”
“Gosh, that could be right,” Bob said. “I think Pete has hit on it, Jupe.”
“I’m not so sure.” Jupe scowled at the green stamp on the envelope. Then, carefully, he peeled it off. “There may be writing underneath it,” he said.
“No,” Bob announced when the stamp was off. “No writing. None on the back of any of the stamps either. What do you say now, Jupe?”
“It’s too peculiar to be an accident,” Jupe said, still scowling. “It has to mean something.”
“Then what?” Pete demanded.
“I’m thinking,” Jupiter said. “Spike knew this letter would be censored. So I deduce he used the stamps to send his message. He put one stamp under another stamp, so neatly it wouldn’t be noticed. He expected Gulliver to examine the whole letter very carefully and find it. I deduce that the one-cent stamp being green, the colour of U.S. paper money, stands for the missing fifty thousand dollars. What Spike meant —”
He broke off, thinking hard. Bob’s shout broke the silence.
“I’ve got it!” he yelled. “A stamp is a piece of paper, see? Money is paper, too. Spike put a piece of paper underneath another piece of paper. Spike was telling Gulliver that the money was hidden somewhere under some paper.
“Mrs. Miller told us that while Spike was hiding out in her old house, he papered the whole downstairs! That was when he hid the fifty thousand dollars. He put the bills side by side and pasted them underneath the new wallpaper!”
“Wow!” Pete said admiringly. “Bob, you’ve got it. That has to be the answer, doesn’t it, Jupe?”
Jupiter nodded. “Yes,” he said. “Remarkable deduction, Bob. I’m just remembering a story I once read. It’s a mystery story by a man named Robert Barr. In it a character named Lord Chizelrigg hides a lot of gold beating it into gold-leaf and pasting it under some wallpaper. The principle is the same. Only Spike Neely used paper money, which is much easier to handle.”
“But wait a minute!” Bob put in. “Mrs. Miller said Spike Neely went out and finished a job for Mr. Miller. Maybe he hid the money there.”
“I don’t think so.” Jupiter shook his head. “The best place would be — Oh! Oh! Oh!”
“Oh! Oh! Oh! what?” Pete asked. “What’re you oh-ing about, Jupe?”
“Spike tells us! That is, he told Gulliver. Right in the letter. Look at it!” Jupiter handed the letter over to Bob and Pete.
“See what he starts off by saying. ‘I may last five days, or three weeks, oreven two months.’ Take those numbers and put them together. They make 532. What does that remind you of?”
“That was the number of Mrs. Miller’s house!”Bob shouted. “532 Danville Street.”
“Right,” Jupiter said. “And look here. He tells Gulliver, ‘If you’re everin Chicago, look up my cousin Danny Street.’ ”
“Danny could be a nickname for Danville!” Pete exclaimed.
“Right!” Jupe agreed. “That mention of a cousin, and Chicago is just put in to distract attention from the words Danny Street. As near as he dared say it, Spike Neely was telling Gulliver that the money was hidden at 532 Danville Street.”
“Under the wallpaper!” Bob chimed in. “He didn’t dare say too much, but that was very tricky, putting one stamp under another!”
“We’ve solved the riddle,” Pete said, jubilant. Then he looked thoughtful. “Now how do we find the money?”
“If it’s underneath somebody’s wallpaper, we can’t just barge in and say, ‘Excuse us, we have to rip your wallpaper off,’ ” Bob remarked.
“No,” Jupiter agreed. “That’s a job for the police. We’ll have to tell Chief Reynolds. It’s no use trying to tell Lieutenant Carter — he made it plain he doesn’t want us bothering him. Tomorrow, though, or Monday, when the Chief is back —”
The ringing of the telephone interrupted him. Startled, Jupiter picked it up.
“Three Investigators, Jupiter Jones speaking,” he said.
“Good!” answered a man’s authoritative voice. “This is George Grant speaking.”
“George Grant?” Jupiter frowned. The name was unfamiliar to him.