Ghost in the Machine by C.E. Kilgore

First in Science Fiction Series, and WONDERFUL! I cried got completely involved and loved it. Ship on a mission with a mysterious alien that nobody knows much about since they remove themselves from everyone's memories once they move on and a series of secrets following her that jeopardize everyone and everything that is important to her. Can she keep the love of her life that her species counsel says she isn't supposed to have? friends? Ends on a cliff hanger so I must start the next book now, but go buy this one it's free at Amazon and worth it.