There is often trouble of a mythical sort in Bath. The booksellers who police the Old World keep a careful watch there, particularly on the entity who inhabits the ancient hot spring. Yet this time it is not from Sulis Minerva that trouble starts. It comes from the discovery of a sorcerous map, leading left-handed bookseller Merlin into great danger. A return to the alternate 1980s England of "The Left-Handed Booksellers of London".