When Lilly Donnelly arrives at the Cutlers' famed Butterfly Mansion in 1899, the massive house and unfamiliar duties threaten to overwhelm her. Victorian Austin is lavish, highly political, and intimidating, but with the help of the other servants, Lilly resolves to prove herself to her new employers. Then, while serving at an elegant dinner party, Lilly recognizes one distinguished guest as Andrew, the love of her life, who abandoned her without a word back home. He seems to have assumed a new identity and refuses to acknowledge her, leaving her confused and reeling. Before Lilly can absorb this unwelcome news, she's attacked. Could it be the sinister Servant Girl Killer who has been terrorizing Austin? Or is it someone after something more personal—someone from her past? Does she dare trust Andrew to help or is he part of the danger threatening to draw Lilly into its vortex?