ALIEN TANGO by Gini Koch

It's been five months since marketing manager Katherine "Kitty" Katt started working with the aliens from Alpha Centauri, and she and Jeff Martini are getting closer. But when an experimental spacecraft is mysteriously returned to the Kennedy Space Center, Kitty and the rest of her team are called in to investigate. Now the team must survive murderous attacks, remove a space entity from a group of astronauts, and avoid an unhinged woman with a serious crush on Kitty's high school boyfriend...