The Bloody Dozen (The Bloody Dozen #3)

The Sun Prison awaits, as do its prisoners: Agvar the Stone, the Crane, Doctor Ortolan, and six other deadly vampire nobles. George, Greta, and Glory Hill are the three astronauts sent to break them out and return them to earth to serve as supernatural superweapons for the Shrouded College... but did someone else get there first and steal the prize?