Having written a review of Mary Shelley's classic last year or so, I will refrain from actually commenting on the story here. Rather I will limit my words here to a few comments regarding this adaptation for younger readers. Frankenstein is a dark book and it is difficult to retain the essential plot elements in a book such as this while making it appropriate for "junior readers." This was a work that my son enjoyed reading with me, but probably the most violent and disturbing tale that we've ever read together (though some of the Harry Potter books were approaching this level). I think that given the storyline, the adapter did a good job retaining the essentials while also bringing this novel down to a younger reader's level as much as possible.
The work bore many similarities to the last two books that we read together (each in different ways): White Fang and an adaptation of Dr. Jekyll & Mr. Hyde, dealing with things such as the ability to conquer nature and what comprises "good" and "evil." As was the case when we finished Jekyll & Hyde we had a fairly long conversation about some of the philosophical themes found in the story and about the narrative structure of the work. And as he is currently studying Greek mythology in school, we also had a discussion about the story of Frankenstein and the related myth of Prometheus. The story was very engrossing for my son (he was eager to read more of it each day), but while he enjoyed the pace of the novel, he prefers the tidy, happier conclusions found in books written specifically for children (e.g., the works of Roald Dahl, L. Frank Baum or J.K. Rowling).