A little girl is abandoned at Mercy Hospital and Olivia is called to investigate. What she finds out could change her life, her relationship, and her family, in some of the best, and the worst ways possible. (Formerly titled "Little One", set in between season 16 and 17 , with some minor tweaking- Nick, Munch, Cragen haven't left, no Carisi yet, no Forgiving Rollins, RATED T-M)