The Reticuli Deception

Sequel to The Chara Talisman. In that book, archeologist Hannibal Carson and starship pilot Jacqueline (Jackie) Roberts traced an alien talisman to a distant world, only to barely escape when a radical group called the Valkaryans tried to hijack what they discovered.
Now they've found more talismans. Combined, these provide a clue to the aliens' home system...but they also link to a legendary UFO abduction back on Earth, a connection the Valkaryans are deadly serious about pursuing.
But that's nothing compared to the secret Carson and Roberts discover about the aliens' past and their combined futures....