As the investigation unfolded, the usual suspects emerged: a rival trucking boss with a grudge as wide as the highway, an ex-wife who stood to inherit a fleet of eighteen-wheelers, and a quiet mechanic who knew too much about the "extra cargo" Big Mac had been hauling on the midnight runs to Riverstone.

The final confrontation happened at the edge of a cliffside lookout. The inspector, cornered by Mike’s quiet logic and Sims’s sharp wit, tried to claim it was a "mechanical failure."

The breakthrough came not from a witness, but from Mike’s peculiar hobby. While inspecting the victim's collection of vintage hubcaps, he noticed a fleck of metallic blue paint—a color that didn't match any truck in the MacIntyre fleet, but perfectly matched the customized rig of the local transport inspector.

The case—inspired by the "The Trouble with Tyres" (7x3)—didn't involve wine this time, but the dusty, high-stakes world of the Brokenwood Trucking community. The victim was a local legend, a man who could change a semi-trailer tire in under five minutes but couldn't seem to navigate the sharp turns of his own personal life.

"Big Mac wasn't just fixing tires, Detective," she whispered. "He was swapping them. New for old, high-grade for scrap. Someone was making a fortune on the difference."

Mike spent the evening at the Snake and Tiger, sipping a flat white and listening to the local gossip. It was Mrs. Marlowe, over a plate of her famous lemon squares, who dropped the crucial thread.

"For now," Mike smiled, looking out at the quiet town. "But in Brokenwood, the dust never really settles."