Cato blackmails Erskine and Haber to get them to break into Changi prison camp to bring out an important civilian bacteriologist. Also, French goes undercover after saboteurs as there have been threats against Sydney's water supplies.
Cato tests Erskine and Haber by making them prisoner and then watching them break out. He then blackmails them by fabricating evidence that they caused over 100 civilian deaths on New Ireland. Cato wants them to break into Changi prison camp to bring out a civilian bacteriologist, Professor Trilby, as there has been a threat against Sydney's water supplies. Things seem hopeless when Erskine and Haber are captured. French also goes undercover at Sydney University looking for leads to the saboteurs.Written by