This is solid middle-grade mystery entertainment—nothing groundbreaking, but it does what it sets out to do. The moon base setting gives it more personality than your average whodunit, and Stuart Gibbs knows how to keep pages turning.

The poisoning plot and some bullying/danger elements are present but handled at an appropriate level for the 9+ crowd. It's the third book in a series, so if your kid loved the first two, they'll want this one for closure. If they haven't read the series, start at the beginning.

Not going to change anyone's life, but it's the kind of book that gets kids reading and thinking, which is worth something. The 4.8 Amazon rating tells you what you need to know—kids like it, parents aren't worried, and it's a decent choice for a road trip or rainy afternoon.