The ninth book in the Star Patrol series tells the story of the missing Crystal. Her journey in a makeshift boat ended hundreds of kilometers from home. The elements threw the girl into an underwater pocket of a completely uncharted island somewhere on Parpland. As fate would have it, she met the missing SOP officer Bionde Neli, who, having been infected with “neuromorphs,” experienced some form of transformation of the body and turned into an extremely dangerous creature that bears little resemblance to a human. The meeting with her almost cost Crystal her life. Parpland managed to bring Bion back to consciousness, and together they set off in search of a way out to the surface. The road, full of adventures and dangers, led them to a picturesque valley located between the mountains. She is hiding something terrible from uninvited guests. Together they will have to learn the secret of the island and find the way home, albeit at the cost of severe hardships and losses.