MR Campion's Falcon

In The Drover's Arms, a four-star upmarket country pub in the Cotswolds, a visitor dies of natural causes and is identified as Matthew James Matthew, a retired engineer and enthusiastic amateur archaeologist who seems to have no immediate family or friends and whose background is vague to say the least. Then the pompous and self-important innkeeper of the Drover's Arms is found dead in very suspicious circumstances miles away, near an archaeological dig in in Suffolk. Can these two deaths be linked to the disappearance of the brilliant but unstable geologist Francis Makepeace?