Crushed by guilt and worries, Noah struggles to find out where his younger sister could possibly be and what happened to her. Although the boy has nothing to do with her disappearance, he still feels that Megan’s absence is partially his fault. If only he would listen to her, when she tried to tell him about something important she noticed in the zoo, then nothing of that could happen.
According to Noah, the only one way to return his sister and solve the secret of the local zoo is to start the investigation by himself. The further he goes the stranger it gets. The boy starts receiving extracts from Megan’s diary which are brought either by a bird or hidden in the most peculiar places in the zoo. He also notices that the zoo guards look rather suspiciously and feels that they might have something to do with his sister’s disappearance. Later on, he tells about his investigation his two best friends, Ella and Richie. Now, when he has needed support and help, Noah acts decisively. With the help of Tank, one of the guards, he sneaks into the zoo at night. Worrying about him, his friends follow the boy some time later.
After many unbelievable adventures and with the help of various animals, they get inside of the hidden and definitely magic world, which is linked to the zoo. They learn that their local zoo is an unusual one, for it was created to help animals in every corner of the world. Unfortunately, since bigfeet got there too, the peaceful existence of the place was disturbed. As it turns out to be, it was they, who kidnapped Megan. After many struggles, the trio manages to save Noah’s sister and establish peace in the zoo over again. The adventure is finished and the kids happily return home.
