Calvin reads his quiz question. Joe and Jack leave their homes at the same time, driving toward each other. One drives 60 mph, the other 30 mph. They pass in ten minutes. How far apart were they when they started? Calvin looks at the paper. Calvin is in his office, hat on, feet propped up, cigarette in mouth. He says "It was another baffling case. But then, you don't hire a private eye for the easy ones". Tracer Bullet is here.

It's Tracer Bullet, Private Eye. It says so on the door. He planned to take the day off with his buddies. They travel light and are fun to have around. One travels in a holster, the other in a hip flask. The last thing he wanted was a case to solve, but the dame who brought it was persuasive. Miss Wormwood tells Calvin to get to work. Calvin is sitting at his desk, with his feet up, thinking it would cost her fifty greenbacks a day, plus expenses.

Tracer steps out to the street to review the facts. Two saps, Joe and Jack, drive toward each other and pass. Questions pour down like rain. Who are these mugs? What are they trying to accomplish? Why was Jack in such a hurry? Why does it matter where they started? He had a hunch that before this was over, he'd be sorry he asked.

Tracer figures he'll try the Derkins dame. Susie and he had never hit it off, occasionally they hit each other. Tracer says Susie has a face that suggests someone upstairs has a weird sense of humor. But he needed information. He figures she looks pretty smug for a dame with a head for numbers, but not much else. The question is, will she sing? Susie tells Calvin she will not tell him the answer and to do his own work.

Bullet says the Derkins dame wasn't talking. Someone had gotten to her and shut her up good. He knows Susie. Closing her mouth would have taken some work. He needed a clue and a drink. He knew where to find one of them. Miss Wormwood grabs Calvin and says he's had enough trips to the water fountain. Tracer says a gorilla pulled him into an alley, squeezed his spine into an accordion, and played a polka on him with brass knuckles.

Tracer's head was exploding with fireworks. When he came to, the pieces fit together. Jack and Joe's life were defined by integers. They were in a "numbers" racket. Back in the office, Tracer pulled the files on numbers big enough to keep Susie quiet and to want him out of the picture. Calvin answers 1,000,000,000 on his quiz. Case closed!