In May 1941 Holst was asked to be the local contact for the agents accomplishing the Operation Josephine B in France. When the agents had to cross the French demarcation line, he was their local contact on their escape route out of France. The subject of the contact was for SOE to remain in communication with these individuals until they would find means of leaving France, or SOE could assist them to do so. SOE asked Holst for any help or indication he could give them in this direction.