"Some lines should never be crossed… but what if love has already drawn the line for you?" Lena Carter never expected to fall for her stepbrother. When her mother married the charming widower Daniel Hart, she gained a new family—including Ethan Hart, her brooding, fiercely protective stepbrother. For years, they danced around their forbidden attraction, pretending indifference. But when a summer storm traps them alone in a beach house, buried emotions rise like the tide. As their secret passion deepens, outside forces threaten to tear them apart—Ethan’s ex-girlfriend resurfaces with a shocking claim, and Lena’s mother grows suspicious. When a devastating betrayal comes to light, Lena must choose: walk away forever or risk everything for a love that was never supposed to exist.