Grissom investigates the murder of two men that leads him to a new encounter with Lady Heather. Catherine is desperate to find out what lead to the near death of her daughter and why her ex, Eddie, disappeared.
Fundamental — Sasha
Played at the beginning of the episode where they are all at the foam party
When Sara Sidle and Brass are in Tray Buchman's room, on the Sphere Hotel, just after the bath party, at the beginning of the episode.
[Found with Shazam]