The Last Trip To Germany. The End of the Z1.

Adventure #10 in the collection The Secret Service Submarine. First published in Thomson's Weekly News 11/05/1918 and syndicated to the Glasgow Sunday Post, 11/10/1918.
Having rescued his former nemesis, John Frazer learns that a kill order has been issued on her and the best German agent said to be in England may be the one likely to take on the job. Still, she and Frazer are in agreement that the agent is really in England for a much bigger assignment but still willing to go after her. Frazer decides this is a good opportunity to lay a trap form him. Helping in this matter is Major Haynes.