Act Normal, A Stan Turner Mystery Vol 9. Tarizon, #3

Stan is recruited by the CIA for its ultra top secret Tarizon Repopulation project. His first assignment is to defend a woman accused of murdering her children and alien husband. The alien husband, however, is not from Mexico but Tarizon, a planet in another solar system. Stan must not only prove his client innocent but also make sure nobody finds out the government is allowing aliens to live and propagate on Earth.
While Stan is busy with his CIA project, Paula is asked to defend the accused in the arson-murder of a prominent scientist and his family. While a bitter feud between neighbors over a barking dog and a chain link fence appears to be the motive for the crime, Paula discovers several others who have benefitted from Chester Brown's death. In the midst of the two murder investigations Stan is lured into a dangerous relationship with an alien woman assigned to keep an eye on him.
He soon learns the women of Tarizon are much more dangerous than those on Earth.