London, 1815. Lily Adler is settling into her new London life when her semi-estranged father arrives unexpectedly, intending to stay with her while he recovers from an illness. Lily is drawn into spending time with Lady Wyatt, the new wife of an old family friend. One morning Lily arrives to find Lady Wyatt's husband, Sir Charles, has died. All signs indicate that he tripped and struck his head late at night, but Bow Street constable Simon Page suspects foul play. With the help of Captain Jack Hartley, Lily and Simon learn anyone who might have profited from the old man's death seems to have an alibi ... until Lily receives a mysterious summons to speak with one of the Wyatts' maids, only to find the young woman dead when she arrives.