Bomba the Jungle Boy on Terror Trail begins the second half of the Amazonian Cycle. The central cast has already been established, with the exception of Gonibobo and his tribe of followers, introduced here in Terror Trail.
The tale related here is a simple one but an exciting good read none the less. Bomba and Gibo are returning to the molocca of Horuhun, having just recently witnessed the kidnapping of Japazy, the half-breed, on the outskirts of the Abandoned City.
The plot can be summed up as Bomba spotting his first airplane and later befriending its three occupants, Ramon, Carlos and Antonio, three Brazilian explorers of the Amazonian Para Basin. A prolonged journey through an underground tunnel and a colopichi forest that threatens Gibo and Bomba with eternal sleep. Finally, captured by the followers of Gonibobo and prepared for a savage torture, Antonio, Gibo and Bomba escape, with the former leaving the Amazon and the latter two returning to Horuhun's village.
And lastly, the mystery of Bomba's grandfather's arrival advances yet another step, as Cody Carson reads from the torn (by an unnamed cannibal, shortly after Bomba's capture. Here we discover that Bomba's father's name is Vassaro Rossi and Arnka was indeed the mother of Eugenio Bomba or Bomba for short. Sobrinini, a retired Italian opera singer (Laura followed in her footsteps), became their friend. Cody Casson was the colleague of the Bartons.