Atahualpa works on the construction of a road that will cross the Llanganates Mountain Range, where it is said that the treasure of Inca Atahualpa was hidden in 1533. One night, Atahualpa is the guide of an expedition that goes in search of the treasure at the beginning of the 20th century.

Millionaire Mason Murphy renovates the haunted Mayhew mansion. He plans a tremendous lunar eclipse viewing party to celebrate his return to his hometown of River Ridge Iowa. At the party, magic runs out of control and the party guests are murdered one by one.