As the article states, this is totally an Agatha Christie plot.
The woman and her 2 kids, who were at The Lunch, did not get even a trace of deathcap poisoning.
dun Dun DUUUUUUN
Sounds pretty murdery, but I've also met a lot of crunchy idiots who make a big deal out of "living off the bounty of the land" but have no idea what's what out there.