The AI Gang: Robot Trouble
In this second book of the AI Gang trilogy, the kids are helping one of the island scientists with his musical robot while continuing to work on their own AI computer. Scrounging for supplies becomes difficult when the head of security employs some seriously scary robot guards, and as the kids prepare to launch the musical robot, Euterpe, into space, it becomes apparent that the mysterious Black Glove is still at large...and has some dangerous plans in mind.
This is a great series, even for those who don't normally enjoy sci-fi. The kids in the gang are very likable, and Coville manages to convey both humorous and tense situations in a natural way.