When an art dealer's wife is taken hostage at gunpoint, Luther leads a tense investigation, as the dark psychological thriller continues.
The hostage takers want payment in diamonds so, stalling for time, Luther substitutes a bag of replacement diamonds from the Serious Crime Unit's evidence safe. Luther and DCI Reed are on hand to arrest the gang members picking up the gems, but when everything starts to unravel Luther begins to suspect that even Reed has double-crossed him.
Luther tries to persuade Reed that between them they can make it work, but Reed knows it is only a matter of time before Luther has to give him up. Terrified and distraught, Reed goes to the only person he knows Luther will listen to – Zoe.
DCI John Luther is played by Idris Elba, DCI Ian Reed by Steven Mackintosh and Zoe Luther by Indira Varma. This episode also features Thomas Lockyer as art dealer James Carrodus; Donatienne Dupont as his wife, Jessica; Ross McCall as hostage taker Daniel Sugarman; Danny Lee Wynter as Tom Meyer; and Alexander Morton as Bill Winingham.