His first impulse was to keep digging until he could explain every fraction of an inch. Then he remembered Jonah's warning and stepped back. He photographed the area again and sketched what he could see without disturbing it further. An accusation of sabotage would mean nothing if he destroyed the evidence while trying to prove it.
He called Jonah a second time. The older man answered from a pickup, with traffic noise in the background and an apologetic edge to his voice. A stalled truck had delayed him near the highway, and he estimated that he would arrive well after sundown. Caleb described the new evidence, and Jonah told him plainly that he had enough reason to keep the motorcycle off the road even if he could not finish every part of the repair.
'Silas Henderson doesn't accept being told no,' Caleb said.
'Everybody can be told no,' Jonah replied. 'Some people take longer to understand it.'
'You don't know what he said to me.'
'I know what a bad frame can do. And I knew Aaron. The man would rather lose a shop than sign his name to something that wasn't safe.'
After the call, Caleb leaned against the bench and looked at the photograph of his uncle through the cracked office window. Aaron had not been a saint. He could be impatient with customers, stubborn about money, and impossibly slow to admit when the family refrigerator needed replacing. Yet when a repair involved the possibility of somebody getting hurt, his temper settled and his hands became deliberate. Caleb had learned that particular calm before he learned most of the technical work.
At six forty-five he found the clearest evidence yet. The frame joint contained a concealed machined insert whose condition and location did not belong to any repair documented in the motorcycle's service history. The insert showed damage consistent with movement inside the structure, and the surrounding metal bore marks that suggested deliberate alteration rather than gradual fatigue. The damaged portion had been hidden by recent finishing work so skillfully that a person inspecting only the paint would have seen nothing at all.
Caleb felt sick. He had held out hope for a defective repair, something dangerous but not intentionally malicious. Now he was looking at work that seemed designed to remain invisible until the machine was placed under a particular kind of stress. He did not know who had done it or when, and he did not know whether its maker had intended to kill the rider or merely frighten him. Either possibility was terrible enough.
He carried the part he had safely removed to the clean end of the workbench and placed it on a white shop rag. Its dull gray surface seemed ordinary without the frame around it, like a piece from an agricultural machine or a discarded bearing. Caleb wrote the time beside the photographs and copied the number from the recent paint invoice into his notes. He wanted a chain of facts stronger than the story an angry customer might prefer.