Tamsin and her best friend Michelle have been inseparable since they were teenagers. Even now they spend all their time together, along with Patrick, Michelle's handsome husband. So when Tamsin hears a rumour that Patrick is having an affair, she is furious. Unwilling to ignore it, Tamsin plots a scheme to catch Patrick in the act, using her assistant Bea as live-bait. It should be fool proof. After all, Tamsin can trust Bea with anything. From her daily coffee order to fetching her dry-cleaning, writing reports and doing all the filing - Bea does everything with a smile on her face. Except Tamsin never considered Bea might have her own agenda. And if she does, then Tamsin really needs to watch her back . . .