1. Part 14

Billy's relationship with classmate Julie threatens his hard-won place at the academy. Mr. Whitaker and Dr Jolland travel to Salzburg to learn why.

3. Part 16

During a visit to the cottage, Miss Price reveals just a little of her past, while Mr Whitaker's acceptance of a sailing invitation inadvertently thwarts an attempt on Billy's life.

4. Part 17

Through a local villager, Billy learns that Karl Gruber was responsible for the boat explosion. He decides to return to the Salzburg Music Academy, not just to resume flute lessons but also in the hope of luring Gruber out into the open.

5. Part 18

Having lost his scholarship, Billy needs to support his studies. He takes a job as a waiter in a cafe, little knowing that the owner is the very man he has been searching for.

6. Part 19

Mrs Dalgleish returns with a message from Kurt: "Stop looking for him." After being told he already knows him, by another name, Billy finally realises who Kurt is.

7. Part 20

Billy confronts Karl and at last learns the full story of how, and why, his parents died.