In rehabilitation therapy following her coma, Allison starts having visions of strange zodiac symbols that seem to be related to the unsolved Libra Slayer killings from eleven years earlier in which the killer left coded letters for police and carved the Libra symbol in strangled women's foreheads. Joe is concerned when Allison subconsciously writes the strange symbols on a school fieldtrip permission slip for Marie. Though author Lance Pauling claims that John David Boatner admitted to being the Slayer on his death bed, Allison dreams Pauling lied about getting the confession and the real killer has resurfaced and is responsible for a recent unsolved strangulation case. Devalos says recent murder can't be the work of Libra Slayer because, unlike the Libra Slayer, the new murderer is left-handed. Allison then dreams about a man she met in rehab, Neal Greybridge, getting mugged and when she wakes up she is able to help police identify Neal's attacker and arrest him. Allison dreams that Neal is the Libra Slayer and was only stopped from further killings because of the injuries sustained during his mugging. Scanlon matches Neal's fingerprint to an old print left by the Slayer, proving he is the killer. Neal's injuries forced him to become left-handed after the mugging. Neal disappears before they can arrest him, but in a dream Allison sees Neal's next victim and the coded letter he will leave at the scene of the crime. Allison realizes the symbols she wrote on Marie's permission slip are actually a key to decode the letter from her dream, and police are able to arrest Neal before he kills again. Joe's new boss, Keith, is an awkward introvert who doesn't want anyone's help on engineering projects, but Joe doesn't want to be transferred because he thinks Keith's work is genius and wants to earn his respect.
