Judgment at Proteus

Judgment at Proteus is fifth and apparent final novel in the series. Judgment at Proteus was published by Tor Books and was released in hardcover on June 5, 2012.

After their discovery in The Domino Pattern that the Shonkla’raa, the original masters of the Modhri, were in fact a special cast of Filiaelian, and that the Filiaeli have re-engineered their genetic structure, Frank and Bayta escort Terese German, who seems to be of special interest to their enemies, to Proteus Station, one of the main Filiaeli genetic research centers. 

(с) wikipedia