For Lela White, a Houston sleep lab technician, sleep doesn't come easy-there's a price to be paid for a poor night's sleep, and she's the judge, jury, and executioner.

Everyone around Lela considers her a private woman with a passion for her lab work. But nighttime reveals her for what she is: a woman on a critical secret mission. Lela lives in the grip of a mental disorder that compels her to break into astronauts' homes to ensure they can sleep well and believes that by doing so, she keeps the revitalized U.S. space program safe from fatal accidents. What began at the age of ten...