Highlights: What challenge does IS pose to Europe's liberal values?

What challenge does so-called Islamic State pose to Europe's liberal values?

We revisit the case of Alberto Nisman, the Argentine prosecutor who was investigating President Cristina Kirchner but was found dead from a gunshot wound the day before he was due to present his report.

Also, after ten years as Germany's chancellor, has the world's most powerful woman overreached? We speak to a close follower of Angela Merkel.