It is the only Chan film which featured both Keye Luke and Victor Sen Yung together.

Luke appeared in one more with Roland Winters, the last of the Chan films, Sky Dragon (1949).

Charlie Chan (Roland Winters), is on his way to Mexico City for a vacation with sons one and two, Lee (Keye Luke) and Tommy (Victor Sen Yung), along with chauffeur and assistant, Birmingham Brown (Mantan Moreland).

As they near the town of San Pablo, they sight Professor Scott who is delirious and collapsed near the road.

Chan, his sons, and Birmingham join the search party that has been organized to find Farnsworth and the lost temple.