This is the 4th and final book in the Spaceheadz series.  The SPHDZ has met their recruiting goal, but now the brainwave has been stolen.  The main character, Michael, and the SHDZ need to find out who took the brainwave and retrieve it.

They know who took the brainwave but they are not sure where to find him, and sightings have been few and spread throughout the world.

Michael and his friends need to stay behind and finish the 5th grade.  Meanwhile there are weird things going on at their school.  Even their new principal is acting strange!

This was an exciting ending to a wonderful series!