Have you ever had one of "those" days? Mac Taylor (Gary Sinise) does, on a regular basis as head of the NYPD crime lab. A young woman has been murdered. This is not unusual. However, eyewitness testimony is going to be a problem since most of the witnesses are mannequins. The cause is obvious, though, a bullet to the head.

Adam Ross (AJ Buckley) to the rescue! He tells Det. Danny Messer (Carmine Giovinazzzo) he has seen the victim before. "Venus" is a cyber-celebrity, making a name for herself in the Internet website game Second Life. People who play are able to transform themselves into whoever or whatever they want.

Mac realizes he will need Adam's help to help solve the case. The technician is delighted, and gleefully sets up turning Mac into the character "Taylor". He asks Mac which gender he wants to be. The look on Mac's face is priceless! Even Det. Stella Bonasera (Melina Kanakaredes) gets in on the fun, taking over when Mac attempts to portray a woman so he can get close to a suspect.

Watching Adam win his "battle" to get a huge break, Mac is impressed. He greets the victory with a smile and a strong handshake, just what Adam needs to continue on. Alas, things go awry when Mac has to raise his voice to get Adam to log off. Mac knows trouble is ahead when the firewall is not able to be utilized. Just as Adam follows orders, all the computer screens go black. Oops!

The list of victims is growing quickly, but catching the killer is tougher than it sounds. Mac, Stella, Danny, and Det. Don Flack (Eddie Cahill) race to a hotel when the next victim is a congressman. They take a SWAT team along just in case. However, only Mac has any luck getting close. It's not enough, though, and capture will have to wait for another day.

On the personal side, Mac tells Flack about Peyton ending their relationship. He knew one of them would have to move if it continued. He belongs in New York, while she belongs to London. Stella, meanwhile, gets a package of rock climbing equipment from Drew, her not-so-secret admirer.