The popular Dr Kilmore is sacked after being discovered in a compromising position on the roof of the nurses' home. The patients are determined not to lose him, and so take on the might of the "cutting" Dr Tinkle and the overpowering Matron.

Bertram Oliphant West (also known as Bo West) wants to clear his unjustly smeared reputation. He joins the Foreign Legion, with Simpson his manservant in tow. But the fort they get posted to is full of eccentric legionnaires, and there is trouble brewing with the locals too. Unbeknown to Bo, his lady love has followed him in disguise...