Ian Reed is Luther's loyal friend.
Justin Ripley goes by the book.
Luther wants to repair his relationship with his estranged wife Zoe.
Luther takes cover from a sniper hunting police officers.
Luther reconnects with Zoe.
Graham Shand changes license plates to elude the police.
Hostage takers kidnap an art dealer's wife for diamonds.
Luther and Alice work together to clear his name.
Mark refuses to let Luther talk to Zoe.
Police convene outside a crime scene.
Ian Reed and Rose Teller search for a missing girl.
Rose Teller and Ian Reed follow the trail of a serial killer.
Luther hopes to win back his estranged wife.
Luther plans to find Zoe.
Luther needs to talk to his wife.
Young detective Justin Ripley requests to be partnered with Luther.
Luther fights Mark outside.
Zoe Luther deals with her estranged husband.
Zoe listens to what Luther has to say.
Mark and Zoe handle Luther.
Luther struggles to speak to Zoe alone.
Luther wants one minute with Zoe.
Zoe and Mark call the cops on Luther.
Luther tries to understand a sniper's motive for gunning down a cop in broad daylight.
Luther and Justin Ripley arrive on the scene of a sniper shooting.
Luther must find the sniper who is targeting cops.
Luther needs to stop a trained sniper before another cop is killed.
Luther realizes that they may be the sniper's next targets.
Luther questions a sniper's rationale for wounding a cop in the middle of the day.
Alice's compulsions will bring her down.
Alice assaults Zoe outside her office.
Alice attacks Zoe.
Alice threatens Zoe.
Zoe walks out of her office.
Alice terrifies Zoe.
Luther storms into Zoe's office.
Luther tries to win Zoe back with a grand gesture.
Zoe refuses to come back to Luther.
Zoe spots Luther outside.
Zoe and Mark watch as Luther tries to get Zoe's attention.
Alice Morgan believes in evil.
Alice discusses black holes and evil with Luther.
Alice Morgan is a brilliant physicist who doesn't understand love.
Alice Morgan teases Luther.
Alice waits for Zoe.
Luther must accept that his estranged wife isn't coming back to him.
Luther walks outside.
Luther walks with his partner, Justin Ripley.
Luther gets emotionally involved in his cases.
Alice grabs Zoe.
Lucien Burgess wants infamy for his heinous killings.
Luther reconnects with Zoe.
Detective Superintendent Martin Schenk
Luther faces suspension after being accused of beating up Mark North.
Luther investigates the abduction of a young mother.
Luther searches for Lucien Burgess's latest kidnap victim before it's too late.
Luther's search for a young mother is threatened by Mark North's accusation.
Martin Schenk recommends that Luther get suspended from the force.
Luther gets blamed for assaulting Mark North.
Luther and Ian Reed search for Lucien Burgess's missing victim.
Luther and Ian Reed hope to save a kidnapped mother.
Lucien Burgess abducts a young mother and is suspected in the murder of another.
Satanic occult killer Lucien Burgess drains the blood of his victims.
Lucien Burgess wants to humiliate the police by getting away with murder.
Lucien Burgess garners sympathy with his autobiography, "Sacrificial Lamb."
Lucien Burgess is obsessed with the bodily fluids of his victims.
Lucien Burgess plans to get away with murder.
Graham Shand will keep killing until he is caught.
Graham Shand's wife, Linda
Linda Shand is unaware of her husband's secret life.
Graham gives Linda a necklace for her birthday.
Graham Shand's compulsion to kill women grows stronger.
Linda Shand wears a necklace from her husband.
Linda's necklace may help solve the case.
Ian Reed investigates the murders of several women across London.
Graham offers a ride to an unsuspecting woman.
Graham picks up a woman on her way home.
Graham changes license plates to elude the police.
Graham Shand eyes his next victim.
Alice pays Henry Madsen a visit.
Alice Morgan will do anything to help Luther.
Alice Morgan visits Henry Madsen after he wakes from a coma.
Luther tries to distance himself from Alice.
Luther receives news about Henry Madsen.
Luther tries to get in touch with Zoe.
Daniel Sugarman holds an art dealer's wife hostage for rare diamonds.
Daniel Sugarman kidnaps and tortures an art dealer's wife.
Daniel Sugarman hides his identity with a face tattoo.
Luther struggles to control his temper.
Luther deals with his marital problems at work.
Luther attempts to manage his anger.
Luther lashes out by breaking a window.
Zoe walks away after Luther breaks a window.
Justin Ripley and Luther try to save a kidnapped art dealer's wife before she is killed.
Luther stalls the hostage takers with a diamond drop.
Justin Ripley and Luther identify the hostage takers.
Luther stalls the kidnappers with replacement diamonds.
Luther tries to get an art dealer's wife back alive.
Luther has to work quickly to save a kidnapped woman.
Luther plans to capture Daniel Sugarman with the help of the kidnapper's wife.
Luther must stop kidnappers from killing an art dealer's wife.
Luther borrows diamonds from the evidence safe.
Zoe and Luther discuss their relationship.
Zoe visits Luther at work.
Luther turns to Alice Morgan for help after he is framed for murder.
Luther waits for Mark North on the stairs.
Luther convinces Mark of his innocence.
Mark and Luther work together.
Mark and Luther plot to capture a killer.
Luther must clear his name.
Luther goes on the run with Alice.
Luther leans on Alice after he becomes a murder suspect.
Luther throws out the evidence against him.
Ian Reed investigates Luther.
Alice helps Luther clear his name.
Alice disguises herself to help Luther.
Alice stays loyal to Luther.