In the aging orphanage, the light reflected from the stars is the only cure for Tim's fear of the dark. One night this fear leads him to the orphanage rooftop, where he discovers that his favorite star has disappeared. Unfortunately, it's not going to be the last one.
Tim also discovers a peculiar character that goes by the name of the Cat Shepherd, which will become Tim's personal guardian. Together with his faithful cat Tobermory, the Shepherd is in charge of making children sleep peacefully. But, Tim is not about to go to bed.
He needs his star more than anything in the world, and he will do what it takes to see it shine in the night sky once again. Tim convinces the Shepherd to take him to see Moka, the guardian of the night.
Tim pleads for Moka to return the stars to the night sky. Moka pays scarce attention to the boys pleas, so Tim asks the Cat Shepherd to take him to the Lighthouse of the Stars, where he thinks he may find the answer to the strange phenomena.
Tim, the Shepherd and Tobermory race against the clock through the streets of Nocturna, a world in which hundreds of the most diverse creatures work to create the night as we all know it. Little by little our friends will discover something strange is happening.
An ominous threat is putting in danger the night and the inhabitants of Nocturna, and Tim is unknowingly the one behind it all.