Season 4 was quite the best one so far. Grissom has changed, he now has a beard as well as a new life…and he wears his LVPD CSI vest. Catherine runs into Sam Braun every now and then, as we learn in Season 3 finale he is her dad. Nick and Sara are in a competition to get a promotion, which falls through the crack. Also in one episode I believe “Early Rollout” Brass is sitting across from Sara in the break room and she’s eating cough drops, which he did as a cop back in Trenton, after he was drinking. In the Finale Sara is pulled over for DUI. Sara has 10 weeks of vacation. There’s something between Sara and Grissom I think. Season 5 will be out in September so that’s a good thing along with Miami S3 and NY season 1.