Once A Cowboy (Harlequin American Romance) - Linda Warren

Brodie Hayes is a former rodeo star, now a rancher--a cowboy, through and through. But when he finds out some shocking news about the circumstances of his birth, he begins to question his identity. Luckily, private investigator Alexandra Donovan is there to help him find the truth about who he is. Along the way, he discovers that even a man who thought he'd be alone for the rest of his life can fall in love.

For Brodie, love was something you did once--and for always. But is Alex the type of woman who can take on a stubborn man like him? Because there's one thing about him that will never change, no matter what they find out about his past--once a cowboy, always a cowboy.