The False Heir by Merry Farmer

She has constructed a world of lies in order to protect herself…
Lady Yvette Mortimer has been the life of the house party at Nedworth Hall right from the start. But underneath her gregarious and exciting personality, she is running for her life. The world of secrets and lies surrounding her have kept her safe for two years, but when she impulsively announces she is Lord Carshalton’s mysterious heir, her house of cards begins to fall around her.

Worst of all, her lies may cost her the love of the one man who could save her…
Nathan Clarke, Marquess of Theydon, accepted his invitation to attend the house party at Nedworth Hall so that he could seek revenge on the man who destroyed his family’s fortune…Lord Carshalton. By discovering and marrying Carshalton’s heir, he believes he can both recover the money that was stolen from his family and have the last laugh. He’s believed Yvette is the heir from the start…but he didn’t expect to fall in love with his target.