Janis Ford 
Street Detectives, The: Sink or swim [EPUB ebook] 

The Street Detectives are back!This time Vuyo and his friends, Victor, Sizwe and Tembile have to outwit an evil gang, blackmailing boat owners in Hout Bay harbour, by blowing up their boats if they do not adhere to their demands for money. The action takes Sizwe to the open sea, but he can’t swim! Fortunately for him a friend guides him to safety and he is rescued. The evil gang is captured and the Street Detectives once again are the heroes of the community The seventh book in the fast-paced and exciting The Street Detectives series