New York Times BestsellerMy disease is as rare as it is famous. It's a form of Severe Combined Immunodeficiency, but basically, I'm allergic to the world. I don't leave my house, have not left my house in fifteen years. The only people I ever see are my mom and my nurse, Carla.      But then one day, a moving truck arrives. New next door neighbors. I look out the window, and I see him. He's tall, lean and wearing all black--black t-shirt, black jeans, black sneakers and a bla