Frank Carter has never taken the time to understand women. And why should he? After all, he's middle aged, happy and very settled. But when his marriage unexpectedly ends, an analytical Frank starts to wonder why he didn't see it coming. Realising that (if he's ever going to be able to trust himself in a relationship again) he needs to know more about how women work, Frank sets about unravelling the rules of engagement. But will the insight gained from prying into the comic yet troubled lives of his three closest friends be enough for him to entice and hold on to the beautiful Jane?