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 Double Helix Book 5 Double or Nothing by Peter David
Like a lethal bacillus coursing through the bloodstream of the galaxy, a fiendish master plan has spread death and terror across the 24th century – until two heroic captains risk everything to stamp out the evil at it’s source.

For more than a decade, since the very beginning of the Starship Enterprise’s mission, unknown enemies have unleashed a string of deadly biological weapons throughout the Alpha Quadrant, infecting ghastly epidemics upon the Romulans, the Cardassians, the Bajorans, and even the Federation. Now at long last, Captain Jean-Luc Picard joins forces with Captain Mackenzie Calhoun of the Starship Excalibur to track down and confront the hidden architects of the plagues – and avenge the deaths of thousands!