1/3 Colin's wife and daughter were brutally attacked in their home, but no-one has broken in.
BBC Radio 4
5/6 After the Geneva revelations, the suave sleuth heads to St Moritz, where danger lurks.
BBC Radio 4 Extra
9/10 Now that the detective has the khansamah at his mercy, what will the servant reveal?
9/10 The detective makes a discovery in Rome, but is he ready to reconcile with his father?
4/6 After a curious train journey to Geneva, the suave sleuth gets a surprise revelation.
8/10 It's time for the Bombay detective to test the theory that he's been building for days.
8/10 The Roman detective hunts for an elusive sculptor; a chance encounter gives him the edge.
3/6 The suave sleuth discovers that Danny Clayton and Mrs Milbourne's stories don't tally.
7/10 Dawkins' servant's splendid turban - that's the problem. The detective is on track again.
7/10 The Roman detective visits his father's creditors, and starts to doubt Varga's veracity.