Detective Alfie Betts is on vacation at Sesame Street and is enjoying a plate of raisin raspberry ravioli when Telly rushes in very upset because his robot and remote are missing. Then Leela enters looking for her rake and roses. When the raisin raspberry ravioli disappears, too, Detective Alfie Betts decides it's time to investigate to find out why things keep going missing. He needs a team of detectives, and Elmo and Abby quickly volunteer. By repeating the items that are missing, they realize that all of them begin with the letter R. Just then, Mumford runs in saying his rabbit is gone too. Luckily, Telly and Mumford saw someone running away each time something disappeared. They describe him and Detective Betts makes a drawing of who they saw. It turns out to be the letter R! So the team gathers up some letters, puts them in a line-up, and matches the drawing to them. They match it to the letter R, who then runs off in a panic. Elmo, Abby, and Detective Betts chase him all around Sesame Street, but he is too quick. They come up with a plan to bring him in for questioning. They set out a plate of rigatoni, which begins with the letter R, and hide, watching to see if the letter R takes it. He eats the rigatoni, but takes off before they can catch him. To slow him down, the detectives decide to put out a heavy rock for him to take. It works, and the letter R admits to taking all the things that start with the letter R. He apologizes, returns everything, and Detective Betts resumes his vacation.
