Devil's Bargain — Gail Mallin

Delia knew she must marry well to restore the Vane family fortune, now that Charles II had been restored to his throne. Convinced she had nothing to offer, she was surprised to attract the honorable attentions of Squire Bolscover, and astounded to attract the dishonorable attentions of Lord Kit Mallory.

Kit's charms were hard to withstand, until her brother Jamie's gambling debts put Celia into Kit's power. Kit would excuse the debts if Delia became his mistress! Delia would bargain with the Devil himself to save Jamie, but must she ruin her own reputation in the process?