Cool series that integrates puzzles and coding elements into the plot. This is the third installment. I didn't read the first two but was able to follow this story fairly easily. Hopper, Eni & Josh are aspiring coders who find themselves on a quest to save their coding mentor, Professor Bee when he is abducted by an unexpected villain. Together, they use their coding and inductive skills to solve a series of problems, each getting them closer to saving their professor and school from destruction. A mystery evolves around Hopper's missing dad and a villain from the past emerges. Some humor, friendship, puzzles, a cliffhanger ending, and action make this a fun graphic novel. Quick read with black & white, green accent illustrations. Grades 4-7.