Book 4 in the Cats in the Mirror series.Agent Onyx, also known as Slinky by her human family, was more than happy to spend her Earth-life hiding under beds and cuddling with her girl, Mindy. But when it's time for Mindy to go away to college, Slinky finds herself being moved to a strange new apartment, away from her sister and the comfort of her home. Just as Kimba is taking big steps toward being an agent in training and Slinky is adjusting to her new life, the timid black cat finds herself accidentally separated from Mindy. Can Kimba, Thoth, Special Agent Artemis, and the rest of the cats at headquarters find Slinky before she is lost on Earth forever? Some cats are born on Earth and never know who they really are. Others are sent. They are undercover for their years on Earth. They know who they are. They know that they are not from Earth at all. And they are part of a bigger plan.