Thomas P. Stanwick, logician and amateur sleuth had come to Mr. Pennyroll's house. Mr. Pennyroll was explaining how he had been kidnapped by bank robbers when he arrived to open up the bank where he was the assistant manager.

"They forced me to open up the safe and give them the money. Then they made me drive towards my home from the bank. They intended on getting my wife's jewelry too," explained Mr. Pennyroll.

"Tell me how you were able to escape, Mr. Pennyroll," said Mr. Stanwick.

"We were driving towards my house from the bank. One of the kidnappers had dumped the money out of the bank bag into a paper sack. Then he threw the bank bag out of the window. Two blocks later we stopped for a red light. He was looking down at the money, and I saw my chance. I opened my door, jumped out of the car, and ran. I ran up to the nearest house, and they let me in. Luckily, the kidnappers did not follow me. They just drove off."

"Let's follow your route back to the bank and see if we can find any clues," said Mr. Stanwick.

They left the house in Mr. Stanwick's car. Soon Pennyroll shouted, "There it is! There's the money bag!" They stopped and picked up the empty bank bag and continued on towards the bank. In a few minutes they came to a light. "This is where I escaped," said Pennyroll.

After getting back to the bank, Mr. Stanwick said, "I have a problem with your story."

What did he notice?