“Billionaire Boys Club” (*** out of four) was a sharply engaging comedy melodrama set in the 1980’s based on the true story of the title boys club (led by Ansel Elgort and Taron Egerton) who established a series of get-rich-quick schemes that turned into a deadly scandal. Very entertaining movie turns unexpectedly dark in the second half but is carried along by fun performances and director James Cox’s lighthearted comic touch. Some scenes are directly inspired by “Wall Street” and “Boiler Room” which this sometimes resembles. Kevin Spacey plays a key supporting role as a Beverly Hills high-roller who plays a part in their scheme.