Blood is the sky - Steve Hamilton

It is October in Paradise, Michigan, and Alex McKnight is rebuilding one of his cabins with help from his neighbour Vinnie LeBlanc. They're interrupted when Vinnie is called away to deal with a family emergency: his brother, Tom, has not returned from a hunting trip to Canada. He is already four days overdue.

Alex and Vinnie decide to retrace Tom's steps, but when they arrive at the lodge, they are told that the men had already been flown back from the outpost, and had promptly left to return to Michigan.

But something is not right. Alex discovers a terrible secret and now he's miles away from civilisation, with no food and no weapons. And there's someone out there who does not want him to make it back alive.