Brendan Doyle is a twentieth-century English professor who travels back to 1810 London to attend a lecture given by English romantic poet Samuel Taylor Coleridge. This is a London filled with deformed clowns organised beggar societies insane homunculi & magic. When he is kidnapped by gypsies & consequently misses his return trip to 1983 the mild-mannered Doyle is forced to become a street-smart con man escape artist & swordsman in order to survive in the dark & treacherous London underworld. He defies bullets black magic murderous beggars freezing waters imprisonment in mutant-infested dungeons poisoning & even a plunge back to 1684. Coleridge himself & poet Lord Byron make appearances in the novel which also features a poor tinkerer who creates genetic monsters & a werewolf that inhabits others bodies when his latest becomes too hairy.