After a bitter custody battle, shots are fired outside the courthouse. Bullets fly and the target is the little girls mother. Horatio goes after the father, who he suspects may not be the girls biological father after all. However, when the mothers shady past is uncovered, the team finds that she has a lot of enemies who would like to take a shot at her. Meanwhile, Calleighs father returns to the crime lab for her guidance but for an unexpected reason.