THE TEAM SEARCHES FOR A GRIEVING MOTHER WHO MAY HAVE GONE MISSING WHILE TRYING TO RESCUE HER SON BELIEVED TO BE HELD PRISONER IN CENTRAL AMERICA ON "WITHOUT A TRACE," THURSDAY, OCT. 11

"Res Ipsa" - The team investigates the disappearance of a grieving mother and tries to determine if she went missing while trying to find her son, whom she believed was tortured and possibly killed while doing volunteer work in Guatemala, on WITHOUT A TRACE, Thursday, Oct. 11 (10:00-11:00 PM, ET/PT) on the CBS Television Network.

SERIES REGULARS:

Jack Malone: Anthony LaPaglia
Samantha Spade: Poppy Montgomery
Vivian Johnson: Marianne Jean-Baptiste
Danny Taylor: Enrique Murciano
Martin Fitzgerald: Eric Close
Elena Delgado: Roselyn Sanchez

GUEST CAST:

Christine Woods: Lindsay Frost
Will Rogan: David Starzyk
Kenny: Brian Bennett
Dr. Lawrence Williams: Tony Todd
Tech: Ty Miller
Angry Woman: Lyn Alicia Henderson
Paula Solis: Camille Guaty
Juan. Wilson: Jermaine Heredia
Davis: Owen Beckman
Richard Griffin: Tom Schanley
Alissa Kline: Dinah Lenney
Francisco Ortega: Julio Oscar Mechoso

WRITTEN BY: Greg Walker, one of the series' executive producers

DIRECTED BY: Greg Walker, one of the series' executive producers

RATING: To Be Announced