Edward and Alphonse return to Central City, seeking the information Marco revealed to them in his note. However, the two quickly are shocked that the Library where the data was hidden was burned to the ground the night before. From testimony given by witnesses, Scar has been named the primary suspect.
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Back in Central City, Envy and Gluttony browse through the library in search of Marco's research. Scar, also there, confronts the two, and a battle ensues.
Ed, Al, and Armstrong arrive back a Central, and Ed cannot wait to get to the First Branch and find the research regarding the Philosopher's Stone. At the entrance to the train station, Ed and Al meet their new escorts, Lieutenant Maria Ross and Sergeant Danny Bloch.
Upon arrival at the First Branch, Ed and Al are shocked to find that the library had been destroyed by a fire the night before. Their only reliable clue was burned to ashes.
Hughes, in his report to Mustang, reveals that Scar was indeed placed at the scene of the fire; however, there is evidence that he fought with someone there.
Uncertain whether or not the book he was searching for was burned or not, Ed questions the librarians from the former First Branch. He finds out that Scieszka was fired from the library a short while ago. Hoping to get some useful information out of her, he heads to her residence. With the lights on and no one answering, Ed decides to look in and discovers a mountain of books. Upon further investigation, he hears the voice of Scieszka crying for help.
After rescuing her from a pile of books, Ed questions Scieszka regarding a hand-written research report by a man named Tim Marco. Not only does she remember the book, she remembers its contents as well. The report is completed in three days, and the brothers head off to the Central Library to read and decrypt the book.
During their research, they are visited by Hughes who has been kept busy by Scar's reappearance in Central City. With the investigation halted because of the fire, Hughes cannot do very much. However, Ed tells Hughes of Scieszka who has all the books of the First Branch memorized.
In a flashback to the fire at the library, Scar realizes that Lust and Gluttony are Homunculus. It is their battle that starts the fire.
Injured, Scar wakes up at an Ishbal village.
Back at the library, Ed comes to the startling realization that the Philosopher's Stone was called the devil's research because it uses live humans as a component.
