Booth and Brennan's investigation into the death of a priest leads them back on the case of the Gormogon serial killer when the priest's kneecaps were discovered to have been surgically removed. They realize the killer has a pattern for choosing victims after Angela finds a victim tree in the evidence vault. The team attempts to make predictions on who the next victim is while Dr. Sweets provides psychological insights into the killer for Brennan and Booth. Meanwhile, Brennan's brother reappears.
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