The explosion was heard twenty miles away. It killed boatmen & wrecked the exotic villa of Lawrence Alma-Tadema the fashionable St Johns Wood artist. But what caused the 1874 Regents Park explosion? Fenian bombs? Sabotage by rival railways or other firms? Or was it something personal? & whose was the other body found in the canal? An artists model? The missing Kings Cross barmaid? Or another victim of the so-called Thames murderer? As he struggles to find the answers Scotland Yards Sergeant Ernest Best straddles the conflicting worlds of art wealth & privilege & that of the poverty-stricken canal boatmen in an intriguing mystery that will change his life forever.