«Double Helix Omnibus» by Peter David,Christie Golden,Dean Wesley Smith,Michael Jan Friedman,Diane Carey,Esther Friesner

Like a strand of mutating DNA, a deadly conspiracy winds its way through the Alpha Quadrant, even as it stretches across several years of Starfleet history. This special omnibus volume contains the entire bestselling saga-by some of Star Trek's most popular authors:
Book One: Infection
John Gregory Betancourt
Deanna Troi's life is endangered by a mysterious plague that threatens to spread throughout the Federation and beyond!
Book Two: Vectors
Dean Wesley Smith & Kristine Kathryn Rusch
On the Cardassian space station known as Terok Nor, Dr. Katherine Pulaski struggles to heal the planet Bajor!
Book Three: Red Sector
Diane Carey
An elderly Dr. McCoy reunites with Ambassador Spock to save the Romulan royal family-and a new generation!
Book Four: Quarantine
John Vornholt
Lieutenant Tom Riker joins forces with the outlaw Maquis to rescue a world in peril!
Book Five: Double or Nothing
Peter David
Along with Captain Mackenzie Calhoun of the Starship Excalibur, Jean-Luc Picard tracks the deadly contagion to its source!
Book Six: The First Virtue Michael
Jan Friedman & Christie Golden
Years before commanding the U.S.S. Enterprise™, a young Picard must prevent a war – and witness the secret origin of a diabolical threat that would someday menace all he cares for!