The Packet
Written by
W. E. Johns
Copyright 1932
2nd of 17 stories in . It was first published in Popular Flying Machine, May 1932. It was reprinted as Peril Over The Line in The Modern Boy #258, Jan. 14, 1933.
Just promoted to the rank of Captain, Biggles is sent into enemy territory to retrieve a cachet of secret plans hidden in a rabbit hole in a field. Two pilots have already perished going after it.