The unsub has identified the "her" in the "save her" messages as eighteen year old Rebecca Bryant, a Bostonian who has been missing for two years. However, by the BAU not following his rules, the unsub has attacked Greenaway at her home, she who is now clinging to life. As with some of the victims thus far, the unsub scrawls a note on Greenaway's wall using her blood. Morgan and J.J. are tasked with following the leads on Rebecca Bryant, while Reid is tasked with deciphering the increasingly complex puzzle, which leads to a personal connection to him. The two tasks come full circle when they both lead to a common end point, which at least identifies the unsub and the reason he contacted the BAU in the first place. The last task is to locate him before he commits his ultimate act in the puzzle. Meanwhile, Greenaway's subconscious battles with thoughts of wanting to live or die.
—Huggo