Russian

When the librarian grabbed Jim’s arms and started speaking in a strange language, he was a little taken aback. But when she completed and he ended up swapping bodies with her, he was downright in shock. The only advice she gave him before bolting out of the building was that if he wanted to ever switch back that he’d “better start learning Russian.”

Jim wondered if that was the language she had been speaking? Was it some sort of spell in Russian? Maybe a book in the library had an answer. He went to the section with all the foreign language books. Of course, he could understand a thing. How could he ever even begin to be able to hope to find a way to swap back? There were so many books, and it would take forever to even begin to know enough to merely start to know where to look.