“By exploring the more difficult sides of friendship, the books about Billie and Bo become unexpectedly moving. (…) These stories provide excellent starting points for conversations about friendship, boundaries, risk-taking, loyalty, unfairness, and much more, not because they are designed as educational tools, but because the situations and relationships are genuinely engaging. (…) The language is light, lively, and full of energy. The dialogue between Billie and Bo is often witty (…) The lesson the children are meant to learn during their week on the island is: “No one is only what you think they are.” They discover this in some wonderful ways, while camp life also includes ghost stories, sneaking out at night, and a first crush. (…) Most significant of all, as in every book in the series, are the challenges of having a best friend who is very different from yourself, but whom you do not want to lose at any cost.”
Lone Bodot, Barnebokkritikk