Brasels is running a gang of German saboteurs, including radical agitator Bill Warne, who is planning to set off a series of bombs.

[8] The plot was partly inspired by real-life events, such as the raid of the SMS Wolf in the Pacific during World War I, and the sinking of the Cumberland off Gabo Island.

These included climbing down a 300-foot cliff, leaping from a moving car, diving 80-foot into Sydney harbour at Coogee Bay and hand-to-hand fighting.

The film was specifically advertised as "not a war picture but a thrilling drama of a special agent's fight against spies in Australia".

[17] The Daily Telegraph praised the photography but reported that the film suffered through a "lack of sufficient plots and indifferent acting.

"[18] The Sunday Times described it as "another upward step in the local film industry, for the producer has got away from the backblocks or early settlers' tales that usually represent Australia on the screen.

Much of the plot material is good, and some of it is very well handled, especially in the outdoor scenes, but generally it lacks that certainty of touch with which the export gives precision and finish to his handiwork.