Trevor Verily was a guest invited to the dinner where Cyrus's will would be read. Trevor was Cyrus's favorite playwright and they were good friends for many years. They even signed a contract for one of the plays. Trevor helps you gather materials for your costume to renact the crime. After you solve the mystery at the mansion, Trevor becomes a potential recruit for your agency. Buddy also mentions his play on "Catz" earlier in the game.
Recruit Request Message
But soft, what light through yonder window breaks? It is Trevor, Master of Disguise, Man of a Thousand Voices! I was was born to be an agent, [Player Name]!