Eleven year-old Ursula Neilsen never believed NASA's verdict that carelessness caused the death of her older sister, an astronaut on a routine mission to a crippled satellite, but there wasn't much a kid could do about it. Years later, she finds herself the target of someone who's trying to kill her because she knows too much. Seeking help from a disgruntled former NASA engineer, she learns the space agency is covering up the presence of an alien her sister made contact with. It's a secret that seems about to cost her her life.