Female sleuth Charlie Parker finds herself pulled back into her family's history when she discovers a cryptic message written in her father's leather-bound notebook hidden in the attic. As she begins to question the events leading up to the plane crash that killed her parents 15 years earlier, Charlie finds herself and others in mortal danger. And her father's profession as a scientist at top-secret Sandia Labs during the Cold War seems to be at the root of the trouble she uncovers.