The Lost CipherSeveral young women have been murdered in a small city in Georgia. The police know that they are being committed by a serial killer, but cannot determine the cause of the women's deaths and have no leads to catch the killer.A three-year-old letter is found at the local college, which threatens to kill Karen Hunter, leader of the Middlefield, Georgia Major Crimes Unit. It taunts the police to decipher a code he has put into the letter with his name.Karen directs her team to investigate past cases and lovers in her life and to solve the ciphers while more killings that are mysterious continue to occur in the city.The killer mails a second letter directly to Karen, which has another cipher included and a deadly promise to kill Karen very soon when she least expects it.While she and her team investigate the murders, Karen renews a relationship with an old boyfriend who she cannot rule out later as a suspect because of his behavior. During the affair, she shares a dark, family secret with him. Karen's husband discovers the affair and threatens to expose her to her friends.Karen and her team work furiously to decipher the codes, but will it be in time to save her life?