This was a really well written, fun adventure tale. It's entirely set on a tropical island which is a setting I really enjoy, especially in horror. It's told across two different timelines (one with our protagonists in the present and one a few hundred years in the past via diary entries) each getting around equal billing in the story. It's something I enjoyed quite a lot and not something I can remember coming across before at middle grade level. The one drawback I have is there's never any scares despite it feeling like we were building towards a ghost/spirits type climax we never do and actually do a complete 180 and it becomes more about conservation and man destroying nature.