Basically, each player is given a single card, which they secretly view, giving them a special power to help the Villager or Werewolf team. Then you press a button on the app to walk you through the ~night phase~ in just a few minutes; after that, everyone has five minutes to figure out who the Werewolf might be!
Promising review: "This game is a blast. Our kids can’t wait to play it again. We sat down the other night just to play a round or two and two hours later we were still captivated and playing. We love that it goes fast which allows you to play just one round when you have just a few minutes or to play multiple rounds. The app that comes with it is ingenious as it takes you through the night phase. We appreciated the little comical lines that occasionally come out in the app. Try adding all the characters to all the different games/expansion packs and listen to what the app says. My kids laughed and laughed." —Sheldon Nixon
Get it on Amazon for $11.09.
You could also consider Codenames, another popular party game, if your group hasn't played it yet — it's $9.99 on Amazon.