Regency widow Lily Adler has finally settled into her new London life when her semi-estranged father arrives unexpectedly, intending to stay with her while he recovers from an illness. Hounded by his disapproval, Lily is drawn into spending time with Lady Wyatt, the new wife of an old family friend. One morning, Lily discovers Lady Wyatt's husband Sir Charles murdered. To uncover the truth, Lily must convince the father who doesn't trust or respect her to help catch his friend's killer before anyone else in the Wyatt household dies.