Grissom has been promoted from senior officer on the graveyard forensics shift to the head of the Las Vegas Criminalistics Bureau. An investigator of the old school, with 17 years on the job, Grissom eschews computer simulations and readouts for the old-fashioned, hands-on technique and legwork. He supervises a team of very diverse professionals on the night shift, and goes to the wall to protect them from department interference and the consequences of their own risky decisions both on and off the job. Grissom, whose speciality is entomology, is a loner. His work is his life - for him, it's the perfect synthesis of personality and profession.