Graydon, William Murray: The Mystery of Valentine Stanlock v1 21 dec 2008
 

Boys go for a hunting holiday in the wilds of Pennsylvania. Val
Stanlock, the local schoolteacher with no past, shows up at the cabin
too. However, besides a catamount (wild cat) a number of nefarious
criminals are also in the woods and they have a completely
unsuspected hideout. Who is Val Stanlock, and why do both he and one
of the criminals want to retrieve a tin box hidden in the wilderness?

Light read with a lot of action going on.

Have fun!