ET was on the set of CBS' "CSI: NY" for the hostage situation! In the season three finale, "CSI: NY" left viewers wanting more after Detective Mac Taylor (Gary Sinise) was taken hostage. Now get an inside look at the season premiere of the show!

Actors Sinise and Eddie Cahill (Detective Don Flack) gave a few revelations into what to expect from "CSI: NY" this season.

"In the season opener, you're going to find out actually what happened in the season ender of season four," Sinise reveals to ET. "Mac finds himself kind of in a remote area, where he's not quite sure where he is or how he got there."

"The events at the bank robbery at the end of season four have taken us over into Jersey City where Mac Taylor has narrowly escaped with his life," Cahill explains.

There's also a new character! "We meet my sister," Cahill reveals, "And she's peripherally tied to this case."

Catch all the characters on the season four premiere of CSI: NY on CBS, Wednesday, Sept. 24.