Out of the Blue (Sunset #2)
Opal Mellon

Molly Harper prefers computers to people. She just doesn't understand everyday interactions. If only emotions could be reduced to binary! But she needs a date for her high school reunion, and a friend recommends the best money can buy: Justin of Club Blue.
Trouble is, Justin and Molly were college best friends. He was always there for her until he disappeared without a word five years ago. When Molly discovers he's the escort, her anger and heartbreak return. Why did he run away? But Justin wasn't escaping Molly. A dangerous figure from his former life was stalking him, and has found him again. This time, he wants a chance with Molly and he's not running.