I used to think there was nothing that could tear Jacob and I apart. I used to think that my husband—guarded, devastatingly sexy, loving—would do nothing to jeopardize the life we built together. Turns out I was right. Unfortunately, my ex has made it his personal mission to ruin us... The Billionaire’s Secret is the fifth installment in the Loving The Billionaire series. Loving The Billionaire Series The Billionaire's Kiss, #1 The Billionaire's Caress, #2 The Billionaire's Risk, #3 The Billionaire's Mistake, #4 The Billionaire's Secret, #5 The Billionaire's Vow, #6