One of Alistair MacLean's poorest books becomes one of the poorest films based on one of his books in this jungle dud. Michael Dudikoff leads the expedition into the heart of the Amazon, culminating in some silly revelatory scenes in which most of the characters turn out to be someone other than who we thought they were. It transpires that they all have various motives for searching for a Nazi scientist in a lost city, but none of the revelations are very convincing. The actors have done better work, some of them have been in great movies (Donald Pleasance, Robert Vaughn) but none of them would be proud of this. It's purely a case of them taking the money and running. Even the jungle backdrop is under-used. You'd think that a film set in the jungle would at least have pretty scenery and some spectacular photography....but oh no, not this one!