Gil Bentley, wealthy financier, anxious to be certain his daughter's boyfriend isn't wanting to marry just for money, hires Frank Crane to examine Stuart Knight's background.Crane discovers the young man is concealing his past. Why is he secretly seeing another woman? Why does he look to have far too much money of his own? He appears to have some sinister connection to a major robbery that happened years before. Other men involved in that robbery are now being murdered.At great risk to himself Crane finally pins down the truth about Knight. But it is a truth so appalling, and which brings him such personal disillusion, that in the end he wishes it had been a case he couldn't solve.