September 1940. As the Blitz takes its nightly toll on London and Hitler prepares his invasion fleet just across the Channel in occupied France, Britain is full of talk about enemy agents. Suspicion is at an all-time high, and no one is sure who can be trusted. In Canning Town, rescue workers are unsettled when they return to a damaged street and discover a body that shouldn’t be there. When closer examination of the corpse reveals death by strangling, Detective Inspector John Jago is called upon to investigate. 

October, 1940. Bombs are falling on Stratford when air-raid warden Sylvia Parks sees a house with a light shining like a beacon to the enemy aircraft overhead, violating the strict blackout regulations. With no answer at the door she manages to break in, only to discover the body of a young woman – and she's been strangled with a stocking. For Detective Inspector John Jago, the scene brings back memories of the gruesome Soho Strangler, who murdered four women in the mid-1930s but has never been caught. Is there a connection? 

September 1940 is finally drawing to a close. With London having endured the Blitz for nearly a month, people are calling for vengeance: Britain should retaliate even harder with their own bombing campaign in enemy territory. But once again the night heralds more destruction. At Custom House, anxious residents dutifully head to the nearest public air-raid shelter as the warning siren wails. When dawn brings the all-clear people disperse, but one man remains - he's dead, stabbed through the heart.

August, 1940. On the streets of London, locals watch with growing concern as German fighter planes plague the city’s skyline. But inside the famous Ritz Hotel, the cream of society continues to enjoy all the glamour and comfort that money can buy during wartime - until an anonymous man is discovered with his throat slashed open. Detective Chief Inspector Coburg is called in to investigate, ably assisted by his trusty colleague, Sergeant Lampson. 

London, 1896. Madame Tussauds opens to find one of its nightwatchmen decapitated and his colleague nowhere to be found. To the police, the case seems simple: one killed the other and fled, but workers at the museum aren’t convinced. Although forbidden contact by his superior officer, Scotland Yard detective John Feather secretly enlists ‘The Museum Detectives’ Daniel Wilson and Abigail Fenton to aid the police investigation. When the body of the missing nightwatchman is discovered encased within a wax figure, the case suddenly becomes more complex. 

1899, South Africa: As the Boer War rages, Captain Ingo Finch of the Royal Army Medical Corps pieces together casualties at the front. Later, recovering in Cape Town, he is woken by local police. A British officer has been murdered, and an RAMC signature is required for the post-mortem. Shocked by the identity of the victim, the bizarre nature of the crime and what appears a too-convenient resolution, Finch turns detective. He is soon thrust into a perilous maze of espionage and murder. 

On his return from South Africa, Charles Knox is invited to spend the weekend at the country home of Sir Neville Strickland, whose beautiful wife Rosamund was once Knox's fiancee. But in the dead of night Sir Neville is murdered. Who did it? As suspicion falls on each of the house guests in turn, Knox finds himself faced with deception and betrayal on all sides, and only the enigmatic Angela Marchmont seems to offer a solution to the mystery. 

She was admired by women and desired by men, until jealousy and past secrets took center stage. Help Cleo and her friends solve the murder of one of London’s leading actresses. When a hotel guest’s mistress is found dead in the stalls of the Piccadilly Playhouse, a verdict of suicide is given. Convinced his lover didn’t kill herself, Lord Rumford wants the truth uncovered. Against his better judgement, he hires Cleo Fox to find the murderer. Cleo needs to solve this case if she wants to make a living from being a private detective.

The North Sea, October 1904 - When Russian warships bombard the Hull trawler fleet, killing innocent fishermen, public outrage pushes Britain and Russia to the brink of war, the sparks from which could inflame the entire continent. Doctor Ingo Finch, once of the Royal Army medical corps, is long done with military adventuring. But when a stranger seeks him out, citing a murderous conspiracy behind the infamous 'Dogger Bank Incident', Finch is drawn back into the dark world of espionage. 

Summer, 1921. Lady Eleanor Swift, the best amateur sleuth in the country, is delighted to be in charge of the prize-giving at her village summer fair. But the traditional homemade raft race takes a tragic turn when the local undertaker, Solemn Jon, turns up dead amongst the ducks. Jon was the life of any party and loved by the entire village. Surely this was simply an awful accident? But when a spiteful obituary is printed in the local paper, Eleanor realizes there may be more to Jon’s death than first thought.

London, 1895. Daniel Wilson and Abigail Fenton have been hired by the Natural History Museum to find out who deliberately smashed the fossilised skeleton of a small dinosaur. At first Daniel is reluctant to take the case, pointing out that they deal in murders, not vandalism. But then one of the attendants in the dinosaur room is murdered, his body found tied to a dinosaur skeleton and a note pinned to him saying 'The price of betrayal'. As Daniel and Abigail investigate, they must negotiate a web of legal and professional tensions.

A scoundrel lies dying, and he makes his confession; his sins were despicable, and he wants to atone for his wasted life. He bequeaths an invaluable gift to Monks Hood Abbey, an ancient monastery set in a lonely corner of the Yorkshire moors. But sin throws a long shadow and corruption crawls in its shade. Strangers come forward and lay claim to the monks' inheritance.

London, 1925. With their band the Dizzy Heights, jazz musicians Ivor ‘Skins’ Maloney and Bartholomew ‘Barty’ Dunn are used to improvising as they play the Charleston for flappers and toffs, but things are about to take a surprising turn. 

England, 1930. An antiques dealer is found robbed and murdered in a third class train compartment on a remote Suffolk branch line. The police believe they know who the killer is, and an arrest is soon made. A passenger on the same train, the Reverend Lucian Shaw, country parson and former army chaplain, is concerned that the police have the wrong man and begins an investigation of his own. Before long, Shaw is drawn into a web of intrigue, deceit, and murder which lurks beneath the surface of a seemingly peaceful country parish.

To solve this case, only an outsider will do...Ingo Finch faces his biggest challenge yet. New York, 1904 - over a thousand are dead after the sinking of the General Slocum, a pleasure steamer full of German immigrants out for a day on the East River. The community is devastated, broken, in uproar. With a populist senator preying on their grievances, a new political force is unleashed, pushing America to ally with Germany in any coming war. Nine months later, Ingo Finch arrives in Manhattan, now an official British agent.