A suitable companion

Earl Barton's daughter's new governess is collected from the stagecoach stop. However, the next morning they discover Clara Thompson is the wrong young lady -- she had been expecting to be companion to a Lady Sutton. But Lady Sutton refuses to exchange her for the intended governess! They have to keep Clara on to help them with the tantrum-prone young Lady Mary while they find a replacement governess. However, could it be that the wrong young lad...