Darien Comes Home

When Lambert discovers that two computer genius brothers from the future has come to the present, he goes undercover as a computer expert. He soon finds that the secretary of one of the brothers saw her boss killing a government agent. She can't say why, though. Lambert digs some more, and finds that he's really hired to hack into a federal computer to steal a fortune. But before he can something about it, the brothers leave with the secretary's brother as hostage. How can Lambert hope to catch them without harming the hostage?