The Bureau of Dangerous Matter

The Bureau has uncovered evidence of the impossible--an invasion from the dimension of matter.  Kerious Pye sends four Explorers to stop the plot, but when they come of age at fourteen, they're already too late.  Stranded in matter, they must devise a plan to rescue the dimension of energy.  

Under siege at the Academy, Matter-Combat Professor Ruskin Fately prepares a highly unusual defense of last resort.