Things aren't quite as idyllic in sleepy county Cavan as we might have thought. There's been a mass killing on the Patrick Shalvey's farm!

The Shalvey family, hosts of Big Week on the Farm, revisit the scene of the crime with Ruth is in search of some answers. The pheasant pen appears innocent enough, but there's something more sinister afoot.

Two weeks ago four of Patrick's ten pheasants were slain.

Where does the evidence point to?
Puncture marks. Patrick suspects a pine martin as the culprit, but wants Ruth to get to the bottom of the crime.

Have any information? Were you a witness? Are you witholding evidence?

Get in touch with RTÉ One on Twitter with the hashtag #OnTheFarm and help solve this mystery.

Big Week on the Farm continues tonight from 7pm on RTÉ One with presenter Al Porter.

If you miss any of the live shows, you can catch-up on the RTÉ Player.

The Ray D'Arcy Show on RTÉ Radio 1 will be doing daily updates on the show every day next week.

Big Week on the Farm is co-funded with RTÉ by Science Foundation Ireland. Science and technology are increasingly part of modern farming and food production.