The brand new series of Silent Witness airs tonight on BBC One at 9pm. The crime drama celebrates its 20th anniversary and brings new cases and characters to 2017. When a people smuggler is found dead, Nikki must delve into London's illegal immigrant community, and she meets a vulnerable Syrian teen who is in need of help.

Sheridan Tongue returns to score the new series with familiar themes and motives. Check out his words on scoring Silent Witness here.