A series of short stories about Biggles and the team's venture into the charter business. Recounted to Biggles 666 Squadron during WWII, but set between the wars, we meet Dr Augustus Duck and adventures with 5 foot crabs, crocodiles, dodos, and Crusaders.

goodreads summary

This contains 16 short stories all of which are unusual in that they consist of Ginger telling his comrades in 666 (Fighter) Squadron of his adventures with Biggles when they were chartered by Dr. Augustus Duck (nicknamed "Donald") to take him to investigate various strange phenomena.