In Equatorial Encounter, Anderson was a Scottish planter who set up plantations in Sierra Leone in equatorial West Africa supplying valuable botanical oils and gums.
After Anderson had secured a successful market for himself among British industries, an American gangster named Griggs approached him and told him of a way to increase his prices by supplying to a different market. Griggs claimed to have powerful friends behind him. Anderson, knowing that Griggs had a bad reputation in the region as a trouble maker, refused to deal with him. Thereafter, Griggs brought in a witch doctor and using a combination of superstition and fear, took control of Anderson's workforce. When Anderson caught a bout of fever, Griggs and his men seized him and had him locked up in a hut at a jungle airstrip which they constructed. Anderson's workers were forced to continue working and the produce was shipped by air from the airstrip to Bouflé by air and then by rail to Port Bouet, both in the French Ivory Coast.
Thus the shipments for British markets dried up and contact with Anderson was lost. The British government sent a secret agent named Joseph Nelson, a Jamaican, to investigate. Nelson was unable to locate Anderson, but reported that work at the plantations appeared to be going on normally. Later, he reported that there were rumours that aircraft were operating to and from the hinterland, using a new airstrip. Thereafter, contact with Nelson was lost. He had, in fact, been caught by Griggs and after being beaten, had been thrown into the lock up with Anderson.
Biggles and co. were sent in next. After a thorough air search, they located Grigg's secret, camouflaged airstrip. As the airstrip lay just inside French territory, Biggles summoned Marcel's help. Together they flew into the airstrip to apprehend the gang. The gang resisted arrest and a brief shootout ensued, leaving Griggs dead and a French policeman injured. The remaining members of the gang escaped in their aircraft but were arrested later on their arrival at Boufle. Anderson and Nelson were freed. Nelson was flown to a hospital in Freetown, Sierra Leone. To Biggles' surprise, Anderson elected to remain behind to continue work on his plantations. to help him establish himself again, Biggles offered to fly in some supplies for him and fly out a load of produce to London to be delivered to Anderson's agent.