I didn't know Mark Douglas had passed. Really sorry to hear that. RIP. I think Trading in the Zone is one of the best books on trading that I've ever read. The Disciplined Trader is also excellent. My recollection is that he wrote Trading in the Zone after The Disciplined Trader and he incorporated much of it in his later book. They're both great, but I'd probably say if you're going to read one then read Trading in the Zone. Mark Douglas deals with the psychological aspects of trading better than anyone else I've ever read. Invaluable stuff.