When does Without a Trace return?

Without a Trace is an American police procedural drama television series that aired on CBS from September 26, 2002, to May 19, 2009. The series focuses the cases of a Missing Persons Unit of the Federal Bureau of Investigation in New York City. It starred Anthony LaPaglia, Poppy Montgomery, Marianne Jean-Baptiste, Enrique Murciano and Eric Close with Roselyn Sánchez joining the cast in season 4. The show is the only primetime U.S. drama to feature two Australians and a Briton.
Each episode followed the search for one individual under tight time constraints. The real FBI does investigate missing persons; specifically, they have the authority to help in any "mysterious" disappearances of children abducted by nonfamily members. A crossover episode in 2007 featured characters Gil Grissom from CSI and Jack Malone from Without a Trace working together to solve the same case.