This is what early chapter books should be: imaginative premise, likable characters, actual plot momentum, and zero filler. Wendy Mass knows how to write for this age group—the pacing is tight, the humor works, and the father-son dynamic gives it heart without getting sappy.

The space taxi concept is genuinely clever, turning the mundane (dad's work) into the extraordinary. Kids get adventure, aliens, and science wrapped in a story that doesn't talk down to them. The illustrations from Elise Gravel keep pages visually interesting for kids who still need that bridge between picture books and text-heavy novels.

It's not going to change anyone's life or win literary awards, but it'll get kids reading, laughing, and asking for the next book in the series. That's a win. Solid choice for bedtime read-alouds or independent reading practice.