Alain De Croes shoots a shop assistant during a failed robbery. When he flees he also shoots 16 year old Dennis Verdonck, because he thought the boy saw his license plate. The only witness is his friend, the 14 year old Nico Van Ham, who is deaf, so his interrogation is very difficult. The police demands help from Nadia Gillis-Barez, Nico's sign language interpreter and ex-teacher. Despite the lack of communication, Matti and Tibo find out the boy is lying, because his story keeps changing. Apparently their friend Sarah also has something to do with it. In the mean time Reggie searches for the robbers gray Escort in the midst of all the cars in Brussels. Thanks to his minute research he can shorten the list severely.