Masquerade — Alison James

Doing all the wrong things for all the right reasons, Cassiopeia Reade impersonates her dear friend Lucinda and drops herself into a comic whirl with an annoyingly charming fortune hunter, a melodramatic demirep, a lovesick maid, and a blackmailer with a bent for kidnapping. But if Cassie hopes to expose the guilty and protect the innocent, she must first risk her own heart and happiness.