Viz’ Fullmetal Alchemist (3‑in‑1 Edition), Volumes 13 – 15 includes Volumes 13, 14, and 15 of the original Japanese manga1. Story and art are by Hiromu Arakawa; English translation by Akira Watanabe; English adaptation by Jake Forbes; touch-up art and lettering by Wayne Truman. The original manga appeared in 2006.
I’m cheating somewhat here. No local source has the omnibus. I tracked down the individual volumes. That should suffice.
Edward and Alphonse’s cunning scheme has paid off beyond their wildest nightmares. The brothers and their allies have managed to capture the homunculus Gluttony.
But their triumph is brief.
Once free, Gluttony sets out to even the score for its fellow homunculus, who died in the flames sent by pyromancer Roy Mustang. Gluttony’s plan succeeds beyond all expectation. Gone: expendable Prince Lin, Gone: Edward and homunculus Envy. Oops.