During a nice summer day, Big Bird, Elmo, Cookie Monster, Bert, Kermit the frog and Grover we're in the middle of recording a new episode of sesame street. Suddenly, as Elmo eats a cookie, he falls from his chair hitting the ground, dead. Detective Chantelle and Detective Hayden were called to the scene for further investigation of the murder of Elmo. Finding clues, looking for evidence, they piece this mystery slowly together. Until a dramatic turn of events occurred, revealing the true murder and his/her's intentions.