I watched this, but found it implausible.
First of all, it's directly linked to the kidnap and murder of his wife, so he wouldn't be working on the case, would he?
Secondly, they've got three bodies, and they row across a lake to an island to bury them? Why not just put stones in their pockets, and tip them over the side?
Thirdly, towards the end of episode one, I was sat there, just waiting to shout out the classic Indiana Jones line - "They're digging in the wrong place!" - and sure enough...
All very predictable so far. Bet you his daughter gets dragged into it somehow. Kidnapped, probably. You saw it here first.