AnnieWalker(PiperPerabo)isanovicespystillintraining,butshesuddenlygetspromotedtofieldagentbytheCentralIntelligenceAgency.Whileherexceptionallanguageskillsmaybeonereasonhersuperiorsareinterestedinher,it'snotthemostimportantone-herbossseemstobemoreintriguedbysomeonefromherpast(herex-boyfriend).ChristopherGorhamplaysamilitaryintelligenceoperativewholosthissightduringamissionandbecomesAnnie'smentorandhandler.AnneDudekportraysAnnie'ssister,amotheroftwo.KariMatchettplaystheheadofaspecialdivisionwithintheCIAcalledtheDomesticProtectionDivision.PeterGallagherportraysArthur,Annie'shusbandandheadofanotherspecialdivisionwithintheCIA.