The Wild Child (The Bride Trilogy Book 1) by Mary Putney
When a younger son of an earl takes his identical twin's place and courts the wealthy, orphaned heiress his brother is supposed to marry, he thought it would be an easy deception. But after he meets his brother's lovely intended, her untamed spirit is more than he can resist. Once she discovers his deception, can she forgive him so their love will last?
Book Length: Long Novel - 320-650 Pages