On Second Thought, by Robison E Wells
Until now, fate has been laughing at Walt Stewart. Unable to settle upon a single meaningful direction for his life, success has eluded him. Then, one day, just as his fiancee' walks out of his apartment and into the arms of his roomate, the phone rings and everything changes. Walt is offered a job that takes him to Alamito, New Mexico, a town beset with colorful, offbeat characters and a mystery that is begging to be solved. As the head of personnel for a tomato-growing greenhouse, Walt will find himself drawn to the weird happenings at a local observatory. Watch out, however - deception lies ahead, and danger, too. But the rewards for staying the course are great: true love and a golden opportunity that could change Walt's lackluster life forever.
