Biggles' Day Off!
Written by
W. E. Johns
Copyright 1932
12th of 13 stories in . It was published in The Modern Boy #295, Sep. 30, 1933
With a week off, Biggles flies back to England and visits his godfather, inventor Dr. Duvency. That man has created a new anti-submarine bomb and a plan designed to drop it. Biggles agrees to test fly it and ends up in the drink! He also has to figure out how to make it back to his squadron in time.