Oh goody. Another SGA novel by Sonny Whitelaw.
A series of horrific ritualized killings sends the Atlantis expedition on a mission to a rarely investigated planet: Earth. When Stargate Command discovers that the cult-like group committing the murders has its roots in a genetic anomaly related to the Wraith retrovirus, the search for answers spans two galaxies. While his team explores a Pegasus planet where Ancient research resulted in other fantastical evolutions, Colonel Sheppard joins forces with SG-1’s Daniel Jackson and an FBI profiler who keeps everyone guessing—all to halt an impending disaster that threatens to alter the very humanity of the residents of Earth.