A tasty mystery is brewing at an Ohio library after more than two dozen empty steak sauce bottles were found behind the books.

Jill Ralston, a spokesperson for the Avon Lake Public Library in Avon Lake, Ohio, said employees found the first bottle of A.1. steak sauce shoved inside of newspapers in January. They have since found another 30 bottles.

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“There’s no label, and the labels have been peeled, but you can tell there had been a label on them,” Ralston told WOIO. “They’re dishwasher clean, dry inside and out, just a hint of A.1. still lingering in the bottle.”

Employees are perplexed because the bottle have been turning up in random place throughout the library. Ralston said most of the time they have found them behind books on the shelves.

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“And some days we find multiples. There have been times when we’ve found many as three or four a day,” said she.

Some people believe it could be local kids playing a prank, but Ralston played down that theory.

“I think they’re being hidden during the day sometime, so that makes me think it’s not a student because we’re finding them after 3 p.m.,” she said.

She did say that if it is in fact a game, the perpetrator should let them know the rules so they can play along.

“Are we messing up the game by finding them and removing them from the shelf? I have no idea," said Ralston.