Books with title Biggles in the Terai

Algy, working with the Indian Security Police to assist them in a gold smuggling racket, has disappeared. Flying to Northern India, Biggles, taking Bertie with him, lands at Shara, just below Nepal, where a 12 mile strip of Jungle all along the Southern border of Nepal called the Terai, forms a perfect boundary with India. Assisted by an Indian mechanic called Ram Singh, Biggles and Bertie commence looking for Algy. They know he had borrowed an Indian Air Force Hunter aircraft from Calcutta and was flying in that when he disappeared

'You're out last hope, Bigglesworth,' said the Air Commodore, with something like despair in his voice.The war supply route between Calcutta and China is a vital one but something is attacking the planes that fly it. Again and again pilots set off, only to disappear somewhere along the line, never to be seen again. When Biggles and his team are called in to investigatem, flying the route is close to a suicide mission . . .