After the political theme of "La guerre est finie",Resnais returns to his familiar subject,time,in all its complexity in this film which is almost as opaque as "Marienbad" or as unsettling as "Muriel".Ridder {Claude Rich,an actor whom Resnais used many times over the years}is a publisher whose girlfriend is accidentally killed and who feels in some way responsible for her death.After listening to a recording by Thelonius Monk,he unsuccessfully attempts suicide after which he has a lengthy recuperation in a hospital .When he leaves,two doctors who have a constructed a time machine ask if he would like to participate in their experiments. Having nothing to lose,he readily agrees and enters the bizarre contraption along with a white mouse,although unlike the fly in Cronenberg's film there is thankfully no genetic mutation involved. He does not travel forward in time,however,but back ,precisely one year to a beach in Brittany.The experiment is supposed to last for a minute but something goes wrong and he is trapped in the machine.Now he experiences a host of memories brought sharply back to life,some important,others banal,in a kaleidoscope of sharply edited images which brings to mind the montages of "Muriel".The theme is reminiscent of many films from "La Jetée" to "The eternal sunshine of the spotless mind" and this rarely seen film is definitely one of the most important of Resnais' career.