Song 9 of the Murder Mystery “Who Is Reptyle Brainz? (Day 4: Emma)” Is the eponymous track following a 2nd murder. This time the victim is one of the prime suspects, Richard Greaves. The song is from the perspective of the lead detective, Emma Simms, who is starting to feel the situation is slipping away from her. It follows a moody and complex journey through Emma’s investigation and her thoughts.