In Biggles and the Blue Moon, Mr P. Tong was the branch manager of Lin Seng's company in Kuala Lumpur, the capital of Malaysia. Biggles first met him when he arrived at Kuala Lumpur on his way to Taihan, the palatial countryside residence of Lin Seng. Tong was described as a "lean, good-looking man of about forty years of age with a serious expression and eyes that held a quality of thoughtful penetration."
At first Tong was cautious in his dealings with Biggles, just as Biggles was cautious in dealing with him. As Biggles noted later, he didn't know Biggles and Algy and they didn't know him. Biggles was surprised, in particular, that Tong did not know about Lin Seng's request to the British government for help to get away from Taihan, or perhaps Tong did not wish to reveal that he knew. The impasse was eventually broken when Tong learned that Biggles was from Scotland Yard and when Biggles had presented his credentials. Among the things Tong told Biggles was the fact that the telephone to Taihan had been out of service for at least two days, leaving Biggles with no choice but to proceed to Taihan on land to study the possibility of establishing a landing ground. Tong surprised Biggles by offering to come along, but Biggles declined the offer, saying that Tong would be of greater service remaining in Kuala Lumpur.
Biggles was proven right when he and Algy found themselves besieged in Taihan by Cortello and his gang of bandits who guarded the only access road. With the phone line out, Lin Seng and Biggles had no means of contact with the outside world. Lin Seng, however, trusted Tong and had confidence that he would find some means of getting a message through. Tong did not let his master down. He hired an aircraft and dropped a message into Taihan. Lin Seng welcomed Tong's resourcefulness, but not the contents of the message, which reported that a group of 50 Indonesian commandoes had landed on the east coast of the Malaysian peninsula not far from Taihan and were believed to be approaching the villa.