4 people, including a recently released ex-con, aboard a tour bus heading for Vegas at night are injured, six even killed, when it suddenly gets out of control and is turned over after hitting medical resident Eric Kevlin's sports car. Only the bus driver survived, either may have caused the crash for a real reason. The bus was also mechanically in unsatisfactory condition, a broken bolt being crucial to the fatal breakdowns-chain, although the company owner had it revised recently, albeit at a cheaper garage. His staff yields an additional suspect.

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