Someone has been hiding books lately — specifically, those that explore politics through a progressive lens, or criticize President Trump. They wind up misfiled in out-of-the-way corners where readers will be sure not to find them.

“I am going to continue hiding these books in the most obscure places I can find to keep this propaganda out of the hands of young minds,” the mystery book relocator wrote in a note left for Ms. Ammon, the library director, in the facility’s comment box. “Your liberal angst gives me great pleasure.”…

Ms. Ammon said she and other workers at the library have hunches about who might be hiding the books, but they have yet to catch anyone in the act. The perpetrator has some support in the community: After a local television station did a story about the missing books, one person called Ms. Ammon to praise whomever had hidden them, complaining that the library only carries books that represent a liberal point of view.