Robert Luketic 's "21” tells the mostly true story about young mathematics wizards who formulated a fail-safe way to beat the tables in Las Vegas . It is a fun and exhilarating ride with predictable twists, but great visuals and a solid young cast answering to ringleader Kevin Spacey help "21” deal out a good story.

Ben Campbell ( Jim Sturgess ) is a hard-working Massachusetts Institute of Technology studen...