Vanessa Ferlito, who played Burn, wanted to leave the series to pursue her film career.

[2] Mac returns to New York with Horatio Caine (David Caruso) as the two attempt to track down Henry Darius, a serial killer who's leaving a trail of bodies in his wake.

Horatio has arrived in New York so that he can keep his promise to a young boy whose mother was brutally murdered in Miami, but by the time he and Mac are able to locate Darius he has disappeared again, leaving behind a trail of six more bodies who were having a party in a penthouse.

The investigation leads them to uncover a deep, dark secret of one of New York's richest families.

After a brief meeting with Darius's psychiatrist, the team realizes they've got a schizophrenic serial killer to track down and stop before it's too late.