Jennifer Lopez to front Netflix's 'The Cipher' The "Hustlers" star will essay the role of FBI agent Nina Guerrera, who is pulled into a serial killer's case after he leaves complex codes and riddles online, which are linked to his recent murders. Share Via Email | A+A A- By PTI Singer-actor Jennifer Lopez is set to topline the feature "The Cipher" for Netflix. The film is based on author Isabella Maldonado novel of the same name and the streamer optioned the book for Lopez and producing partners Elaine Goldsmith-Thomas and Benny Medina, reported Variety. The "Hustlers" star will essay the role of FBI agent Nina Guerrera, who is pulled into a serial killer's case after he leaves complex codes and riddles online, which are linked to his recent murders.