A Counterfeit Suitor is the fifth in the Rosalind Thorne series of Regency mysteries by Darcie Wilde (a pseudonym for Sarah Zettel). Rosalind is a gentlewoman living in reduced circumstances after her father–an alcoholic, gambler, and forger–left England to escape his debts and avoid criminal charges for forging promissory notes. He had taken Rosalind’s sister Charlotte to Paris with him, while Rosalind and her mother stayed in England. Her mother has died since these events took place, a few years before the beginning of the series, and Charlotte has become a courtesan. To support herself, Rosalind solves problems for gentlewomen in trouble, to avoid family scandals. Usually, that means investigating murders with the help of her love interest, handsome Bow Street Runner Adam Harkness.