With impeccable research, and without a single inappropriate archaism or self-conscious "mediaevalism" Unsworth, with great subtlety, catches the spirit of the times. The images of death and corruption (both of body and soul) mirror the social, moral and spiritual collapse of mid-14th century England: the Black Death has literally halved the population, land has gone out of cultivation, labour is scarce, prices have risen, people are starving. The feudal system is disintegrating, hastened by the social and economic consequences of the Hundred Years' War. The colourful pageantry of the Christmas jousting masks the debasement of the chivalric code into greed, selfishness and brutality; the purity of the monastic ideal has been replaced by materialism and venality. No wonder there is an upsurge of millenarian sects prophesying the Last Days. The transition of drama from religious to secular is already in process, and Martin takes his players in a visionary and shocking leap forward, fusing the old Mystery Plays with the newer Morality Plays, and for the first time using real events and real people in his True Play of Thomas Wells. The process of detection and the build-up of tension are brilliantly handled; the language, techniques and traditions of mediaeval drama fascinatingly described. Though we can see where the story is leading, the denouement has enough surprises to be satisfying. Though you could read it just as a mediaeval whodunit, you would be missing a great deal. Don't be deceived by its 188 pages. This is a deep and many-layered book - increasingly rewarding with every reading.