A routine inspection turned into a sweet bust for authorities in Brooklyn this week.

State Finance Department officers, who were at the Gates Candy & Grocery store in Bushwick on Wednesday for an untaxed cigarette inspection, reportedly tipped off police. Their suspicions were apparently raised by a hidden door.

RELATED: Rikers Island guard charged with smuggling drugs

Police returned the next day with a search warrant, allegedly uncovering more than just candy — heroine, the narcotic fentanyl and drug paraphernalia — all part of an alleged drug operation inside the secret room.

According to   ABC7, police estimate the haul to be about $100,000.

Two men were arrested in the bust, according to CBS3 — Hamdan Alsaidi, 33 of Queens, and 46-year-old Mohamad Ali of Manhattan. They face multiple charges, including drug trafficking.

Neighborhood residents were surprised that the local shop was hiding that kind of stash.

"I didn't know they were selling drugs there, you know paraphernalia bag for weed, that I knew, but as for drugs, no," William Morales, told ABC7.

“At face value, you see what you see but you never know what’s going on behind closed doors,” resident Benny Senises said to CBS3.