Loving the premise

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The two main characters, Jakob and Lizzie, having the kind of stereotypical sibling relationship that makes them very relatable.
Told from first person POV, narration seems to alternate between the two. This is my favorite type of POV, so it's very readable for me, though younger readers may need to flip back to the beginning of the chapter to keep track.

Still, I love puzzles and this book is right up my alley!