The Shovel(2006)

When weekender Paul Mullin discovers his neighbor digging a hole in the middle of the night, he writes it off as simply a bizarre encounter. Until the neighbor... and his cheating wife... disappear. Worried he’s stumbled upon more than he’s bargained for, he calls on the local sheriff to help unearth the truth. And finds out that, in a small town, some secrets are better left buried.