Secrets of Success by Tony Forrester
Divided into four sections - constructive bidding, competitive bidding, defence and declarer play - this book is targeted at all players who want ideas to help them improve their bridge. Instead of assuming that progress means learning increasingly obscure conventions or exotic safety plays, Forrester emphasizes the principles fundamental to successful bridge, from the real way to value a hand to how to read inferences from the bidding, from how to lead, signal and discard effectively, to when to overcall and when not.