- Rian Mitchell discovers an emerald deposit in South America, but gets chased away before he can start to mine. He tricks his partner, Vic, into returning to the site. While there, he meets Catherine and Donald Knowland, siblings who run a coffee plantation. Rian falls for Catherine and is torn between his love for her and his love for the "green fire" of emeralds.
- Dr. Steven Sorenson plans to tap the geothermal energy of the Earth's interior by means of a thermonuclear device detonated deep within the Earth. Despite dire warnings by fellow scientist Ted Rampian, Dr Sorenson proceeds with the experiment after secretly learning that he is terminally ill. This experiment causes a crack to form and grow within the earth's crust, which threatens to split the earth in two if it is not stopped in time.