There Should Have Been Five - By MJ Honikman

 First published 2016 by Tafelberg, softcover. The wraps and pages are clean and unmarked. A fictionalised account of the real actions of Job Maseko, who as a captive of the Germans during World War Two, destroyed a German munitions ship. From Wikipedia:

Job Maseko or Job Masego MM (died 1952) was a South African soldier during World War II, serving in the Native Military Corps^[1] (NMC).

Maseko worked as a delivery man in the South African town of Springs^[2] before volunteering for service in the Native Military Corps. After completing his basic training, he was sent to North Africa with the South African 2nd Infantry Division.

He became a prisoner of war on 21 June 1942 when Major-General Hendrik Balthazar Klopper, surrendered to Field Marshall Erwin Rommel at Tobruk with 32,000 men, including 10,722 South Africans of the 2nd Division (of which 1,200 were Native Military Corps members).

While a prisoner, he constructed a bomb, using a milk tin, cordite and a fuse and, with the help of fellow prisoners Andrew Mohudi, Sam Police and Koos Williams, managed to hide the device on a German cargo boat at the docks of Tobruk. The boat was destroyed in the explosion later that afternoon.^[2] He was later presented with the Military Medal (MM) by Major-General F H Theron.