Paperback: Spy the Lie by Philip Houston, Michael Floyd and Susan Carnicero with Don Tennant (Icon Books, £8.99)

Let’s say someone might have committed a crime. You’re asking him questions. Let’s say he’s OJ Simpson. How do you spot the signs that he might not be telling the truth? What questions should you ask him? This book, culled from the experience of three former CIA officers, gives you pointers.

When people are guilty they often give odd, evasive answers. They try to find out how much you actually know. Your job is to catch them in the act of fishing for information. So you don’t ask Simpson: “Did you do it?” You say, “What happened at Nicole’s last night?” Then watch him think.