1/6 The Roman sleuth heads to Germany's Barbarian forests, home to a giant bull.
BBC Radio 4 Extra
2/10 Young lawyer Robert bumps into an old friend, back from making his fortune in Australia.
2/6 The detective witnesses the aftermath of a crime, and gets a hostile welcome in Germany.
3/10 Robert invites George to meet his uncle's young wife. But she's reluctant to receive them.
4/8 The team race to find a dangerous new supplier before his drugs flood the streets.