Setinanuncannyfuture—orperhapsaslightlyalternatepresentwherecellphonetechnologyisnowheretobefound—AnnaandherpartnerRyanhaveachievedeverycouple’sdream∶theyareinpossessionofadocumentcertifyingtheirtruelove.Theircomfortableifsomewhatmundanelife，however，leavesAnnaquestioningtheirsuccessfullovetest，administeredbyplacingtheirextractedfingernailsintoacutting-edgemachine.AnnasoonbeginsworkingfortheLoveInstituteunderthetutelageofDuncan(LukeWilson)，which，inadditiontodeterminingacouples’statusviathemysterioustest，trainsthemtodeepenbonds.There，she’spairedwiththeexperienced—anddevastatinglycharming—Amirtotakecouplesatvariousstagesofrelationshipsthroughaseriesoflove-buildingactivitiesbeforethebigtest.Asthenewcolleaguesworktoamelioratetheconnectionsofclients，AnnabeginstowonderifperhapsAmirisheronetrueloveandiftrustingherownfeelingsisamorereliablemetricthanwhatisdeterminedbyamachine.