Mike and Jackson dig into why Harold left so quickly with his rifle, wearing a suit and dress shoes, while leaving the door open and an lamp burning. The more they dig, the stranger the theories get.

In the 1930s, workers came to the Minden area to build a highway - many of the workers had just left prison. Mike and Jackson explore a theory about the workers' involvement in Harold's disappearance.

The trail leads Mike and Jackson to suspect Harold's neighbours of foul play. Using ground-penetrating equipment, they investigate a suspicious bump in the nearby forest that could blow the case open.

Mike and Jackson wonder if the local townspeople closed ranks to protect Harold Heaven’s killer. They interview descendants of Harold’s neighbours to hear what they remember about the case.

Mike and Jackson discover that Harold, a bachelor and loner, had a close friend. They question whether there could have been more to the relationship and what that could potentially mean for the case.

A new clue reveals a potential break in the case, leading Mike and Jackson to investigate a private lake.