Ken felt a sudden, uneasy sense of recognition. This was the same kind of thing he had heard about on the radio that morning! A rash of car breakdowns all over the country. Now, the same thing in Mayfield!

"What's wrong with them?" he asked the mechanic. "Why is everybody coming in with trouble at the same time?"

"They're not coming in," said Art. "I'm having to go out after them. I don't know yet what's wrong. They heat up and stall. It's the craziest thing I've run into in 30 years of garage work."

"Mine acted the same way," Ken said.

"Yeah? Well, you're in good company. Listen, why don't you and maybe Joe and Al come down and give me a hand after school? I'll never get on top here without some help. After we get these police and other priority cars out of the way, maybe we can get a quick look at what's wrong with yours."

"It's a deal."

Joe Walton wasn't much in favor of spending that afternoon and an unknown number of others in Art's garage; he was too overwhelmed by the idea of analyzing the material of the comet's tail. However Art had done all of them too many favors in the past to ignore his call for help.

"The trouble with this town," Joe said, "is that three-fourths of the so-called automobiles running around the streets belong down at Thompson's Auto Wrecking."

Al Miner agreed to come, too. When they reached the garage after school they saw Art had not been exaggerating. His place was surrounded by stalled cars, and the street outside was lined with them in both directions. Ken borrowed the tow truck and brought his own car back from the Larsens'. By that time the other two boys were at work.

"Batteries are all okay," Art told him. "Some of these engines will turn over, but most of them won't budge. I've jerked a couple of heads, but I can't see anything. I want you to take the pans off and take down the bearings to see if they're frozen. That's what they act like. When that's done, we'll take it from there."

Ken hoisted the front end of one of the police cars and slid under it on a creeper. Art's electric impact wrenches were all in use, so he began the laborious removal of the pan bolts by hand. He had scarcely started when he heard a yell from Joe who was beneath the other police car.

"What's the matter?" Art called.

"Come here! Look at 

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