“How was it done, Paul?”

“It’s all in the report. We’ll need an expert to check out the details, because a wide variety of transactions is involved; but the method is essentially simple. You bribe a programmer to feed fraudulent instructions into the computer. Unless they are cancelled, the computer acts on them from now till doomsday.…”

“Why didn’t we pick up the discrepancy ourselves?”

“Because we all take the computer for granted. So long as daily transactions tally, we don’t question it; and we’ve got such a wide variety of operations, only the accountants and auditors take any notice of the final figures.”