A woman leaves her phone on the Docklands Light Railway in east London. A stranger picks it up and follows her off the train in a bid to return it, but the woman has disappeared. He searches the streets and eventually spots her in a coffee shop. He will accept no reward for his gallantry. This is perhaps the least likely thing that happens in Informer (BBC One). Seconds later, a terrorist gunman runs in and shoots the good Samaritan, which is more believable than the random act of kindness that put him in the path of the bullet in the first place.
Never mind – we are moving swiftly on. In an empty courtroom, counter-terrorism officer DS Gabe Waters (Paddy Considine