This book is a Dead Man's Plack and an Old Thorn written about Dead man's plack. One of my literary friends, who has looked at the Dead Man's Plack in manuscript, has said by way of criticism that Elfrida's character is veiled. I am not to blame for that; for have I not already said, by implication at all events, in the Preamble, that my knowledge of her comes from outside. Something, or, more likely, Somebody, gave me her history, and it has occurred to me that this same Somebody was no such obscurity as, let us say, the Monk John of Glastonbury, who told the excavators just where to look for the buried chapel of Edgar, king and saint. I suspect that my informant was some one who knew more about Elfrida than any mere looker-on, monk or nun, and gossip-gatherer of her own distant day; and this suspicion or surmise was suggested by the following incident.