Becky Collins was still mourning the loss of her beloved cat, Marty, who had lived to the impressive age of twenty-one. Hoping to ease the emptiness, she adopted two adorable kittens from a rescue centre. One of the kittens shocks Becky by possessing the ability to speak. Becky soon realized there was something very strange about the kitten that called herself Penny.

When her other kitten, Cally, was catnapped right out of her backyard, Becky was devastated. She had never felt such a gut-wrenching sense of loss and worry as she did that day, the brazen act leaving her stunned and heartbroken. With Penny's help, they scoured the neighbourhood, until they ended up at a rundown house a few streets away. Inside the house Becky found Cally, and the body of a woman lifeless on the floor. Penny recognised her as the person who had taken Cally.

As the truth was revealed, and the real killer emerged Becky faced a test of endurance, and a reality she never believed existed. She realised then her quiet life would never be the same-forever changed by the kitten who called herself Penny.