Deep Space Intelligence : Masters Return

#4 in the series.
Tagg Raven is settling into his new position as Boss. He is faced with a frustrating situation. Space pirates! But with no ransom demands, how are they supposed to deal with these villains? When a commercial space-liner vanishes with over three hundred passengers, D S I Military, General Frank Millet is sent to try to hunt the pirates down. Is it pirates, or has a deadly, evil enemy returned to haunt them? Is this the final showdown?