A rare interest in corpses - Ann Granger

It is 1864 when Lizzie Martin takes up the post of companion to a wealthy widow who is also a slum landlord. Lizzie learns that her predecessor disappeared, supposedly having run off with an unknown man, but when the girl's body is found in the rubble of a recently demolished slum near St Pancras station, Lizzie begins to wonder exactly what has been going on. With the help of a childhood friend, now Inspector Benjamin Ross, she starts to investigate, risking her life to unearth the truth about the death of a girl whose fate seems interlinked with here own.