Wicked Knight — Tierney O'Malley

Ruggedly handsome pediatrician, Dr. Tristan Knight, is done with marriage. Once is enough. Eager to avoid making another mistake of getting trapped in marriage vows, Tristan wields strong control to suppress his growing attraction to his sister's friend, Julie Parrish. But his resolve is tested when an unusual request for help lands on his lap-marry Julie.
Author and former model, Julie Parrish has been trying to keep her image clean, otherwise, her drunkard father will get the inheritance her mother has left her. She will never let that happen. But her stepmother, Marla, has learned about the will's stipulation. Since then, she's been attempting to prove to the lawyers that Julie is far from being clean. Fortunately, her mother has added an out to the will. Marriage. So when Tristan surprised her by offering his help to end her problem with Marla, she accepts. But Julie wants more than just a ring. She wants the elusive doctor's heart.