Rosie is a mischievous eleven-year-old girl, with secrets. When the Scientist-uncle visits her and her friends, as well as African cat Astrapi and Penguin Robert who admire his newly invented Astrolabe, little does she know what great adventure awaits them. Curiosity is too strong a power to resist. As soon as her youngest friend moves one of the device's needles, they all hover in the air, before their astral travel to a mysterious island begins. Travel to the dimension of the living people.

The journey has been tough. After an agonizing battle the eight friends experience, they appear in a ghost-inviting city, in the future. The place where they will face their greatest fears. Their Nemesis has a plan. A plan that could destroy Rosie. A plan that could bring despair not only to all humans but to spirits and aliens as well. And nothing stops their enemy in their pursuit. Not even 'time'. Will the young Lightworkers defeat all evil, before the Astrolabe's needles move again? Or will darkness prevail?

In the midst of everything, a mysterious sandstorm paints the city orange. Especially around Koule Castle. When a young girl is being pushed off the castle's roof...