Icy immortality faces the Saint when he is chosen as the subject for an eerie experiment by being frozen to death and then brought back to life.Keith Longman (CLIFFORD EVANS), head of a leading engineering firm, has a strange obsession about death - particularly his own. He has a plan to become immortal by being frozen to death and then brought back to life. But will the plan work? He needs a guinea-pig to try it out first, and the man he selects is Simon Templar, the Saint (ROGER MOORE).But Keith Longman and those who are helping him hesitate to put forward the proposition in cold blood. They propose to condition him.Among those co-operating with him are his daughters Vanessa (VERONICA CARLSON) and Stella (JAYNE SOFIANO). Among a silent procession of five people who approach the Saint is Vanessa, who presents him with a small box and tells him: We want you to think very hard and very deeply....about death.' In the box, a small white mouse nibbles lettuce.But a medical warning that Longman's heart is in a precarious state means that the time for the experiment has to be put forward. Longman rejects Stella's plea that the Saint should be persuaded, not forced. One thing Longman has not reckoned with is the Saint's curiosity. Realising that he is being 'conditioned' for something, Simon sets out in search of Longman's base. The trail takes him to Cornwall - and eventually to facing Longman and receiving the offer of a million pounds if he will agree to the experiment.But it seems that there is no option. The Saint finds himself sprayed with a deadly liquid and falls unconscious. When he comes round, he finds Stella trying to rouse him and telling him that she will help him get away. But when sisters disagree, anything can happen . watch