Ruby Redfort : blink and you die
(Book)

"A bunch of people want Ruby Redfort dead, and worst of all, one of them is on her team. When your name is first on a mastermind's hit list, do you lock the doors, switch off the lights, and wait for someone else to do something? Or do you get out there and save yourself? If you're Ruby Redfort, genius code breaker and undercover agent, the choice is clear: death or glory. In a satisfying series finale, surprises are in store and Spectrum's backstory comes to light as fans bid good-bye to Ruby Redfort, every smart kid's smart kid"--Provided by publisher.