This underrated '70's psycho-thriller is aided by a strong cast, which includes Mark Lester(of OLIVER! fame) as the disturbed youngster, Britt Ekland as the terrified stepmother, Hardy Kruger as the boy's well-meaning, but clueless father, and Lilli Palmer as a seemingly level-headed psychologist. Admittedly, it's little more than THE BAD SEED with a sex change and a few kinky, voyeuristic sequences thrown in for good measure, but the wonderful cast has done wonders with their roles, particularly Lester who gives a startlingly mature and downright chilling performance as the evil child. After seeing him go at it as the little stepson from Hell, it's hard to believe that this is the same little boy who captured our hearts in the award-winning musical "OLIVER!". It takes a good actor to play two wildly different roles so convincingly, and that's Lester. After seeing him in these two films alone, I'm convinced he's one of the finest child actors of all time! After doing some research, I've discovered that the magnificent Lester has retired from show business and is now an osteopath. The medical profession's gain is our loss.