Robert Merrill

Cole and Phoebe both fall under the spell of the Siren, who lures husbands to her and entrances their wives to follow with the intent to kill, leaving Piper and Paige to figure out how to save Phoebe.

Bobbi Dobkins’ (guest star Sharon Lawrence) arrest for hiring a male prostitute exposes some unorthodox steps she’s taken to improve her sex life. Grayson (Jackson Hurst) fights to keep a client’s divorce case from being moved to Wyoming.

Can knowing a secret be a motive for murder? The CSI team must figure out if a change in gender is cause for the death of a showgirl. Also Lindsay goes back to Montana to try to put the person who committed the murder of four friends behind bars.

Horatio's ex, Kyle's mother, resurfaces as a billionaire's widow, who will do anything to get her son back.

April and Beth share their concerns about the shortcomings of each other’s boyfriends, which sparks tension in both relationships.

April starts her treatments but she begins to panic as the chemo and hospital confinement take their toll on her so she reaches out to someone unexpected. Meanwhile Dominic finds a changed April when he returns.