Walking in Pimlico - Ann Featherstone

To 'walk in Pimlico' colloq. to be handsomely dressed
Murray's Dictionary of Slang, Cant and Flash Words and Phrases (1857, 3rd ed.).

Stumbling across Bessie Spooner's murdered body, comedian Corney Sage is caught in a tangle of deception and lies. He flees from his concert-room job in London's Whitechapel to a comfortable spa town, and then to a circus and music hall. But try as he might, he cannot elude the killer. And in Corney's world of theatricals, clowns and showmen, where appearances are surface deep and secrets are deadly, any one of them might be the murderer . . .

From the drawing rooms of polite society to dingy lodging houses, through shabby pump-room pavilions, fairgrounds and freak shows, Ann Featherstone brilliantly reconstructs nineteenth-century England in this gripping psychological thriller.