Raising his orphaned teenage sister isn't easy for Texas rancher Cash Maddox. The girl tests his parenting—and patience—at every turn! But when he asks new teacher Olivia Grayson for help with his sister's grades and attitude, Cash realizes he's facing the toughest trial of all. He made a promise that he wouldn't date and get distracted from his mission of being a good father figure. Yet Olivia's quick wit is drawing him unexpectedly closer to the caring beauty every day. Could it be time to make a new vow…one that'll last a lifetime?