Axel steals a business law textbook from beth. curt, who does not know that the book is stolen, buys it from axel. curt has committed

The answer is that Curt has committed conversion.
Conversion can happen even when a man mistakenly trusted that he or she was qualified for that goods. As such, great aims are not a guard against change. Somebody who occupied stolen products has conferred the tort of change regardless of the possibility that he or she did not know the goods were stolen. In the event that the genuine proprietor brings a tort activity against the purchaser, the purchaser should either restore the property to the proprietor or pay the proprietor the full estimation of the property in spite of having effectively paid the price tag to the thief.