Tom and his dog Snuf are pursuited by German soldiers. After some daring moments they are saved by Dries, a older guy that's able to speak fluent German. Once Tom is laying in bed later that evening, he is awakened by the sound of German anti aircraft artillery that managed to shoot an English plane out of the skies. The pilot manages to jump out of his aircraft with a parachute. The next day he decided to start looking for him together with Snuf. After a long search he found him on one of those many islands in the river. The parachutist seems to be a Dutch soldier called 'Captain Brandenburg). Tom is happy that he found him, but now he has the daring task to find a safe way to home.

Tom is very happy as Snuf healed from his wounds and returns to home, while the German Jewish girl Mirjam found refugee with uncle Tjerk, but they are being betrayed and being raided by the Germans. Captain Brandenburg manages to escape to the allies via the swamps, but Tjerk and Bouke are arrested. Mirjam barely escapes thanks to Tom and Snuf. They flee and finds out the traitor that tries to set up a trap for allied forces. After a difficult tour through swamps, they manage to warn the Allies and to reveal the traitor. Will the Germans flee after an Allied attack?