Harry Caul is a sincere Catholic and a lover of jazz songs that plays his saxophone while hearing his jazz documents. He is a San Francisco-based electronic security expert that has and also operates his own little monitoring organisation. He is renowned within the occupation as being the very best, one who creates and also constructs his very own security equipment. He is an intensely exclusive and singular guy in both his individual and also specialist life, which particularly upsets Stan, his service associate who typically feels shut out of what is happening with their work. This privacy, that includes not allowing anyone into his house as well as constantly telephoning his customers from pay phones is, partly, intended to control just what occurs around him. His and also Stan's most current job (a challenging one) is to tape-record the exclusive conversation of a young pair conference in crowded as well as noisy Union Square. The plan with his customer, known just to him as "the supervisor", is to provide the audio recording of the discussion and photos of the pair directly to him alone in return for payment. Based upon situations with the director's assistant, Martin Stett, as well as what Harry eventually hears on the recording, Harry thinks that the lives of the young pair remain in risk. Harry utilized to be removed from just what he tape-recorded, yet is now worried ever since the fatalities of 3 individuals that were the straight outcome of a previous audio recording he created another job. Harry not only needs to determine if he will certainly transform the recording over to the director, but additionally if he will certainly try as well as conserve the couple's lives utilizing information from the recording. As Harry takes place a quest to learn what exactly is occurring on this case, he discovers himself in the center of his worst problem.