ADJ.
expert, inside
VERB + FORGER
spread
PREP.
on
noun
A person who creates forgeries, falsifies documents with intent to defraud, e.g. to create a false will or illicit copies of currency; counterfeiter.
A person who forges metals.
noun — someone who makes copies illegally
The sudden outflow of counterfeit notes from the bank alerted investigators to an expert forger on the inside.
Rumors spread that the forger had bribed the guards at the palisade with expertly faked coins, buying himself safe passage.