The Werewolf Club by Daniel Pinkwater

It was about some people going back in time and went to the wrong time. so then the people go in the right time and they turned it to Werewolfs and one werewolf said he was hurngry. Then the werewolf went to get some food so he ate then the werewolfs back home.Then they checked if they were a werewolf and they were not a werewolf.