Hal Junior lives aboard a space station orbiting a distant planet. His best friend is brainy bookworm (free homework help!) and his teacher is a funny little robot which really does have eyes in the back of its head.

With Hal Junior around, it needs them!

Today is extra-special, because a supply ship is arriving and Hal's class has been invited aboard for a tour.

During the excursion Hal uncovers a sinister plot, but he can't warn teacher because the little robot has mysteriously gone missing.

Can Hal Junior save everyone aboard the Space Station, despite the danger?

The Secret Signal is a middle-grade science fiction adventure, illustrated with sketches and diagrams.

Hal Junior is an ideal book for boys aged 9-12, although girls will love Hal's hair-raising adventures too.

Keywords: funny books for boys 9-12, kids books for age 9 and up, scifi for kids, children's sci fi