<p>Medivac helicopter pilot Jett McNally's heart belongs to an Army officer she left behind in Afghanistan, and good-time anesthesiologist Tristan Holmes is no substitute, except possibly in bed. </p><p>When Jett comes home from the war and destruction in the Middle East, everyone she knows thinks she should be happy. How can she explain she left a big part of her life behind, including her heart? Flying and the adrenaline-rush of a crisis are the only things that make her happy, and she volunte...