- The story zips along with lots of laughs, mysteries and adventure. It's like Dennis the Menace in space, great fun!
- I know that the kids in my class will just love this. It doesn't come any more highly recommended than that!
- HAL JUNIOR: THE SECRET SIGNAL should be renamed Dennis the Menace in Space. What a fun story.
- Haynes' trade-mark humour is not only verbal, but also in witty diagrams, and his clear plotting and story-telling provide lots of enjoyment.
- The characters were funny and easy to love. The storyline was full of action and mayhem and it makes you want to never put the book down.
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