From the back of the book:
Continuing the great exploration of the Third Imperium, Deneb Sector provides new ground for your players to explore, colonise and capitalise!
Part of the Great rift, Deneb Sector is nevertheless a vitally important link in the Imperium, forming the major route between the Imperial Core and the Spinward Marches. Those from the core see the section as barbaric while those in the Marches view it as decadent and past its age. Home to one of the brightest stars in the entire galaxy, Deneb is a sector of wonder and fortune...
To use this supplement,a Referee will require the Traveller Core Rulebook.