The Heart of Stone series moves into the next generation with Hard As Stone, ​a full-length novel featuring Tristan and Nina's son, Ethan. Trouble. Playboy. Heartbreakingly gorgeous. Ethan Stone, the only son and spitting image of billionaire Tristan Stone, has a long line of women who would kill for a night with him, and rumor has it he's more than happy to oblige. But Ethan has a problem. His family wants him to settle down. Why, he can't understand. But he needs to figure out a way to convince them he's given up his wild ways while at the same time living his life the way he wants to. He has a plan, though, and Summer Carmichael, the quintessential girl-next-door, is perfect to help him. But Ethan better watch out or he might just find himself falling for exactly the kind of woman his family wishes he'd bring home.