Five alleged victims gather for the inaugural meeting of “the club no one wanted to join.” They say they were sexually harassed, exploited, assaulted or raped by Walker. One says her friend’s father punched the music teacher in the face. They want to find the man who threw the punch.

Robinson meets Sam, the man behind the punch. He said in 1975, when he found out his 16-year-old daughter had sexual encounters with her high-school music teacher, he went to the principal. When Walker moved schools, he told Robinson about the punch — it made her feel sorry for him. But now she knows what really happened.

In the latest season of the BBC’s World of Secrets: The Bad Guru Miranda’s search for inner peace through yoga leads to allegations of grooming, trafficking and exploitation. “You just get sucked in so gradually... that you don't realize,” says her mother Penny. This series contains explicit sexual content, some strong language and allegations of sexual exploitation. More episodes are available at: https://BBC.lnk.to/WoSRF

Jackie Short kept detailed diaries as a teen. She knew the teacher was making sexual advances to multiple students. At the same time, he was courting another teacher who would become his wife. On a band trip to Germany, Short told an administrator what was going on at their high school.

The desk in Jeanie McKay’s teenage bedroom had 56 notches: one for every time she had sexual intercourse with her music teacher. It would become evidence years later, when Walker was found guilty of professional misconduct and banned from teaching. During his statement, he referred to his former student as a “blip.”

Robinson couldn’t help but think if she knew there were other victims, the outcome of the case would have been different. The investigation finds another survivor, Robinson reaches out and gets a response right away: “Hello Powerful Woman.” She finally meets the woman who got the teacher banned.

More than a year after Robinson went to police, William Douglas Walker was charged with a sex crime. She alleged he groomed and controlled her when she was 16. After four and half years in court, a judge said there wasn’t enough proof she hadn’t consented to sex. The case was dismissed.

Robinson stored her painful, high-school memories deep in her mind. But it all came flooding back in midlife after she saw the music teacher. She decided to confront him. That meeting led Robinson on a journey to discover what really happened and report it to police.

As a teen, Anne-Marie Robinson dreamed of becoming a professional musician. The talented French horn player soon became the music teacher’s favourite. But it wasn’t the kind of attention she wanted. On a band trip, he bought the kids alcohol and she ended up in his hotel bed. Decades later, she ran into him. It was like seeing a ghost.

Anne-Marie Robinson says that as a teen, she was raped by her music teacher. He says it was consensual sex. She reached out to journalist and podcast host Julie Ireton to share her story and together they have uncovered a trail of teen victims.