The ice sea pirates, by Frida Nilsson (1979-)
When her sister Miki gets kidnapped, her sister is faced with the task of finding her. Unfortunately some pirates have taken Miki and to find her. her sister is going to have to go to sea. This is a truly well written book that is a pleasure to read. I recommend this book to children 8+.
Reviewed by Luke from Karori and Karori Normal School , 12 years old