Season five of Spiral transmission date confirmed by BBC4

As we all know, BBC4 has become the de facto place to get all your foreign-language crime drama nourishment. Over the years the channel has broadcast such dark delights as The Killing, The Bridge, Wallander, Inspector Montalbano, Salamander et al. Another channel hit is gritty French crime drama, Spiral (or Engrenages in its native tongue)….