Biggles Investigates by W. E. Johns was a collection of short stories which was first published in October 1964 by Brockhampton. It does not appear that these stories had been first serialized or published elsewhere. The stories are mostly set in Britain.
Biggles Investigates was the ninth and last anthology of short stories written about Biggles in the Air Police and consists of 8 stories:
- Algy does not appear in any of the stories in this anthology. In the 3rd story, Bertie mentions that he was still in India. In Biggles and the Plane That Disappeared it was first mentioned that he had gone to India to look into a gold smuggling case, details of which would latter be narrated in Biggles in the Terai.