English detective DCI Alan Banks returns in this fourth series of the popular crime drama with three new, original stories inspired by Peter Robinson's bestselling novels.

• What Will Survive - DCI Banks struggles to cope with the sudden death of his mother, as he investigates the murder of a young Estonian woman and the disappearance of her drug-dependent sister.

• Buried - Banks must navigate difficult emotional territory when the body of an eminent lawyer is washed up in an underground river and he suspects a member of her grieving family is responsible for her death.

• Ghosts - The body of a university student is found dumped in a ravine. His friends claim he was a model undergraduate, but officers Annie and Ken soon discover that he had a double life manufacturing ecstasy.

• Aspect Ratio : 16:9
• Rated : Suitable for 15 years and over
• Language: : English
• Director : David Richards, Craig Pickles, Kenny Glenaan
• Media Format : PAL
• Run time : 4 hours and 28 minutes
• Release date : 15 Aug. 2016
• Actors : Stephen Tompkinson, Andrea Lowe, Caroline Catz
• Studio : BBC
• Producers : Radford Neville
• Writers : Nick Hicks-Beach, Paul Logue
• Number of discs : 2