The Genesis Wave Book One (Star Trek: The Next Generation)

Intended to create life from nothingness, the Genesis Device had the potential to become a weapon of awe-inspiring destructiveness, capable of rearranging matter and life energy on a planetary scale. After the cataclysmic explosion of the Genesis Planet, and the Klingon Empire's attempt to steal the top-secret technology for its own military purposes, Starfleet wisely decided to destroy all data and records on Project Genesis, hoping to bury its deadly secrets forever.
Nearly a century later, all that remains of Genesis is the knowledge stored in the mind of an elderly, almost-forgotten scientist named Dr. Carol Marcus. But Dr. Marcus has gone missing, and a menace from bygone days has come rushing back with a vengeance.