This is yet another entertaining medieval tale from Kate Sedley. It's 1477 and Roger the Chapman, still on his 'honeymoon' with his new bride in Bristol, England, finds his restlessness returning. Driven by some instinct that his skills as a sleuth are needed, he sets off through Dartmoor to Plymouth on the southwest coast of England. Roger's instinct is soon proven well founded when he hears of a brutal murder, the victim a Master Capstick, a well respected and wealthy businessman. The chief suspect is Capstick's great-nephew, Beric. He is seen leaving the scene by many witnesses, but when the constables arrive at his manor, Beric had somehow managed to vanish completely. The locals believe the witchcraft of their ancestors, and blame the Saint John's fern, which if eaten can make a man invisible. Roger, not convinced,begins his own inquiries, and when an attempt is made on his life, he knows he must be close to a truth. A most enjoyable read that provides the reader with an excellent sense of life in those harsh times of medieval England. As a murder mystery, the plot was an interesting one, but I have to admit that I solved it a couple of chapters before the end.