S4E29 : Get to the Roman Colosseum!

After his death, Abbacchio was able to leave the others a copy of the boss’s face and fingerprints with Moody Blues' replay. The others try to find out who the boss is with the fingerprint and suddenly get contacted by someone. The mysterious man tells them that the boss’s name is Diavolo and tells them that the secret behind defeating him lies in the arrow. Bucciarati and the others head to Rome to meet him.