While investigating a diamond heist, disgruntled cop Harper falls for Holly, the top suspect's main squeeze. When she convinces him to kill her boyfriend and make off with her and the loot, they start down a treacherous path full of dark surprises.
Produced by the Aluminum Company of America (Alcoa) in 1940 and released in 1941 , Unfinished Rainbows traces the history of aluminum in brief, dramatic episodes. It shows the challenges presented to the youth of the 1940s of the opportunities in the world of chemistry.