spoiler devastate by the loss of his ten year old daughter mary and pamelyn ferdin and in a car accident that he hold himself responsible for well know cybernetics professor samuel constable and ray milland and have be visit her grave almost every day . this be start to worry his invalid wife lenore and gene tireny and in feeling that he go insane . it some three month after the accident that prof. constable start to believe that there may well be something very psychologically wrong with him when one even driving home he run into and and almost run over and a live mary constable walking along a lonely road . be a man of science prof. constable doesn not believe in anything like ghost or the supernatural but after see and talk to mary he start to believe in it . at the insistence of a friend dr. frank furgerson and george macready and prof. constable go to see a man who could help him solve this dilemma dr. alex lauder and don murray . dr. lauder be one of the world big expert in the field of parapsychology . dr. lauder be so impressed by what prof. constable tell him and what he see and hear himself and in mary sudden appearance at the constable home . that make dr. lauder almost a true believer and like prof. constable and in the supernatural . this leave the door open for dr. lauder to investigate if all these ghostly event be real or somehow manipulate by people behind the scene . not what you would expect at first daughter of the mind be a lot more then a ghost story it also have a lot to do with the defense of the united state that prof. constable be very much involve in his top secret work for the pentagon . mary in her appearance keep tell her father and prof. constable and about all the bad he do in help develop weapon of war for the u military . it for that reason that she somehow trap in an in between or astral world and will never find peace . that until her father stop do anymore research for the u government . prof. constable weird behavior also attract the u government intelligent agency in the person of cic agent saul wiener and edward asner and who have him and now dr. lauder follow day and night . the cic and agent wiener feel that prof. constable be be dupe into defect to the soviet union by these vision that he be have about his dead daughter mary . very well make for tv movie that as good a any film that be release in the theater back in 1969. with an intelligent script and believable end and an end far too believable for a movie about the world of the supernatural and dark science . the supernatural be handle in a very unusual and honest way in the film by at first not try to disprove it and then try to make those who believe in look like gullible and mindless fanatic . at the same time not hit the audience over the head with it and the supernatural . by make it look like anyone who doesn not believe that such a world and beyond the proof of modern science and exist be a slave to what he and or she and be think in school . as well totally lack in any kind of constructive and abstract imagination of the unseen and unknown world and or world and around u . which over the year bring into be some of the great achievement and advancement in the world of science and medicine .