The Heelers suspect a local horse trainer of assaulting and robbing a bookie. Jo becomes intrigued when she discovers a page torn from a diary after questioning the trainer's strapper, stable hand and assistant jockey. The writing is troubled and Jo is concerned that it is a cry for help. Jo discovers the diary belongs to the young stable hand. Has someone been hurting him and why won't he say? When the trainer is found bashed and the stable hand is missing, Jo worries he has finally fought back. The trainer dies and the stable hand is convinced he is responsible. Jo is determined to prove his innocence. Were the bookie and the trainer assaulted by the same person? Can Jo help the young stable hand find the strength to speak out?