The ultimate rule of friendship states it clearly: your best friend's sister is completely off-limits. But when Liam Fredrick, the notorious college bad boy, finds himself irresistibly drawn to exactly that forbidden territory, the bro-code crumbles. Can he resist what his heart desperately wants, or will he risk everything for love? Sisters might not have their own code, but they certainly have their own agenda. While brothers fiercely protect their siblings from their best friends, sisters gleefully push them together. When golden boy Zian Ahmed meets Emma Hart—his sister's bubbly, quirky new best friend—he discovers that some rules are meant to be broken. Her infectious energy awakens something in him he never knew existed. Chemistry proves that like dissolves like, yet physics insists opposites attract. When two fiery, headstrong personalities collide, sparks ignite. Zahir Ahmed, the rebellious bad boy with a dangerous edge, encounters Emily, a sassy and fierce force of nature. Their combustible connection threatens to burn everything down—or build something unforgettable. As these three brothers navigate forbidden desires and unexpected connections with the Hart sisters and their circle, they'll discover that soulmates don't follow the rules. They rewrite them.