This series is getting more and more exciting!
Eric, 11 years old

THE FEAR WITHIN US IS THE STRONGEST PRISON
When Alrik and Viggo have a themed day at their school, something quite terrifying happens. The ice breaks under Alrik! Maybe the mermaid lures its victims from under the ice armor? In addition, a new steward arrives at Gripsholm Castle, who is somehow creepy. And to top it all off, the boys' mother also appears in Mariefred... with the worst surprise! And no one even guesses what the consequences of the surprise will be!
Mermaid is the sixth part of the PAX series.