Little Did You Know by Michaela Sawyer

Nick Pearson thought he had it all – wealth, success, and a string of beautiful women at his fingertips. But when Olivia Ryan, his childhood friend’s sister, unexpectedly enters his life, everything changes.
Haunted by a tragic past and harboring dark secrets, Nick finds himself drawn to Olivia’s innocence and vulnerability. As passion ignites between them, Nick struggles to keep his carefully constructed walls from crumbling.
But Olivia has secrets of her own, and when her troubled brother Emmett’s dangerous choices threaten to destroy them all, Nick must decide how far he’ll go to protect the woman he’s falling for – even if it means losing her forever.