A public library in Ohio has plenty of mystery novels on its shelves, but there's an even saucier non-fiction mystery they're trying to solve.

For the past few months, staff at the Avon Lake Public Library have been noticing empty bottles of A-1 steak sauce placed all around the library. According to the library's Facebook page, 30 bottles have been found on book shelves since January. The library's public relations coordinator doesn't think there is any bad intent behind the anonymous prank, but they're not giving up on trying to figure out a possible hidden message or whodunit. 

It must be some mis-steak.