The Lost Girls (CSI: Crime Scene Investigation) The Lost Girls (CSI: Crime Scene Investigation) "The Lost Girls" is the seventh episode of season 10 of "". It is also the final part of a crossover trilogy that links all three CSIs together for the first time; the trilogy began on "" with "Bone Voyage" and continued on "" with "Hammer Down". It features Laurence Fishburne as Dr. Ray Langston, who trails the case of a missing girl from Miami to New York and back to his home town of Las Vegas. Dr. Ray Langston is back in Las Vegas and still searching for Madeline Briggs after trying
CSI: Crime Scene Investigation Hall, and California State University, Los Angeles. While shooting took place primarily at Universal Studios in Universal City, California, Santa Clarita's surroundings had proven so versatile, "CSI" still shot some outdoor scenes there. "CSI"'s theme song was, since the last episode of season one, "Who Are You", written by Pete Townshend with vocals by lead singer Roger Daltrey of The Who. Daltrey made a special appearance in the episode "Living Legend", which also contained many musical references such as the words "Who's next" on a dry-erase board in the episode's opening sequence. In certain countries, to avoid music licensing fees,