Its about 2 kids who can get into books and live there stories.
In 2 books there is a treatment.
The first one is in book 2: The spy's secret.
In this book were they are spy's they get captured and end up tied up side down above a couple of sharks.(this is the only image of that treatment)
The second treatment does not have a image because there is no pickure in the book.
In book 4 the kids go in a fantasy book were the guy becaume a wizard and the girl a elf.
alound with a female knight they go to some elf but when they get there they get captured get tied up.