Era of Secret Spells

"Era" is a world of game where steam, magic, machinery, alchemy, and extraordinary powers coexist.
When Luke transmigrated and was held at gunpoint by an imperial spy with his head covered, he decided to tell a lie.
Then, he became a detective of the Secret Intelligence Bureau in the Cape District, Golden Shield Empire.
Knowing the plot well, Luke only wanted to survive in this soon-to-be chaotic world, make some money, and get some materials to enhance his power with secret spells.
He robbed, kidnapped, extorted, and used the plot guide to commit crimes, but he never expected that robbing an imperial gold transport ship would lead to the uncovery of the largest smuggling case in the history of the empire.
As a "fake" detective, holding the promotion order, Luke felt very awkward...