What happens when not only Jennifer Jareau meets a detective in New Orleans but David Rossi 21 year old daughter Isabella Levi-Rossi is surprise after three years since her ex boyfriend broke her heart and not knowing she was pregnant with his child on the JONES case that the father of her two year old daughter is Steve McGarret a 27 year old former Navel Seal whose now an lieutenant commander and is Will cousin comes to help him with his father old case?