It is a time of darkness. With the end of the Clone Wars, and the destruction of the Jedi Order, the evil Emperor Palpatine rules the galaxy unopposed.

When the parents of Milo and Lina Grafare abducted by agents of the evil Empire while the family is out on a mission mapping the unknown systems of Wild Space, the children must undertake a perilous journey to rescue them.

In the third book of this six book chapter book series, Milo and Lina track the mysterious transmission to the planet Lothal, hoping to find help against the Empire. But as Lina and Milo search for the source, they are unaware of the danger following them at every turn.