Ruby Redfort- Secret Twin.

Sarah Lockwood, a thirteen year old from Australia, is told by her parents that she is adopted and that her real parents have right to take custody again. Her parents are teary, but understand that it is for the best.

Her family are the Redforts, a rich socialite family who lives in Twinford, California. The family consists of Ruby, Sabrina, Brant, the housekeeper Mrs Digby, the butler (house manager) Hitch, who is secretly part of the organisation Spectrum, a secret spy group which Ruby is also a part of and Sarah will become. They also have a husky named Bug.

This series is set in the 70s, when the book series is also set.