Captain MacKenzie Calhoun has faced incredible odds before, but nothing he has ever experienced could prepare him for the simultaneous threats from two of the most destructive forces he's ever encountered. The first is the D'myurj--a mysterious and powerful alien race bent on either the complete domination of humanity or its destruction . . . a potentially massive risk to the very foundations of Starfleet, one that goes so deep it's impossible to determine whom to trust. The second is even more alarming: Morgan Primus, once a living creature with a soul and a conscience, now an incredibly sophisticated computer simulation taking up residence within the very core of the U.S.S. Excalibur . . . and quickly becoming a growing menace for the Federation. MacKenzie Calhoun is playing a dangerous game as he attempts to outwit and outmaneuver these new enemies, with the fate of the Excalibur crew members and potentially the lives of billions at stake. . . .