On the dating app called Gotcha, the tag line reads connecting the unusual, but the mechanics are the same as Tinder or Raya or Grindr. You swipe right for yes, left for no, send winks and pokes and pics. The app has a map thingy that helps you echolocate your date like a bat when you’re matched. This is what Nate did the night he met Peta, following a green line along Des Moines Avenue, all the way to Charlie’s Kitchen, where his destiny awaited.