Lily Adler has just started to feel settled into her new London home when her semi-estranged father arrives, intending to stay with her while he recovers from an illness. To placate and avoid him, she takes his place in a social visit with Lady Wyatt, a woman she doesn't know. But then Lady Wyatt's much older husband is found dead in his library. Bow Street constable Simon Page suspects that Sir Charles was 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.