Scotland Yard's most unlikely pair of detectives must hide a blossoming romance as they hunt for a dangerous killer. An Irish redhead of humble beginnings and modest means, Kathleen Doyle is the antithesis of Chief Inspector Michael Sinclair, as known as Lord Acton, the brilliant but enigmatic lord with a knack for solving London's most high profile homicides. When a horse trainer is found dead at a racetrack, the duo's investigation does little to deter the killer at large. Jeopardizing the case are their colleagues at CID headquarters, whose nosing into the nature of Doyle and Acton's after-hours relationship threatens to lay bare the most classified information of all. As the murders pile up, Doyle and Acton uncover something far more sinister than they could have imagined. Now that they know too much, their partnership could be very brief indeed. . . "Thrilling...Will keep you guessing until the very last page."—Victoria Thompson, bestselling author of the Gaslight Mysteries "It's been a long time since I encountered two characters this charming and engaging. I look forward to more of their adventures."—David Morrell, New York Times bestselling author of First Blood and Before I Wake