Summer 1923. Lady Eleanor Swift is finally persuaded by her butler, Clifford, to take a villa in the south of France for the season. She plans to do what a glamorous lady abroad should: long lunches on the balcony followed by lazy afternoons lounging by the pool. But when Clifford examines the wine cellar, he discovers there are no decent reds, but there is a very dead body. The victim is famous American movie-star Rex Armstrong. Poor Rex seems to have been stabbed with a sword from the film set. So how did he end up in Eleanor’s villa?

Kitty Underhay is accompanying her fiancé, Matthew Bryant, and Bertie, his new cocker spaniel, on an outing to Torbay Country Club. However, the delightful day soon turns to disaster. Walking Bertie in the shaded grotto after an exhilarating archery demonstration, Kitty makes an unsporting discovery: the body of their host, Sir William Winspear, with an arrow in his back.

Kitty Underhay is looking forward to a week of long lunches and wedding planning with her husband-to-be, Captain Matthew Bryant. But the plan is derailed when he is called on to collect a former comrade-in-arms, arriving on the 15:50 from Paddington. As the train bearing Simon Travers pulls up to the platform, a piercing scream rises over the screech of its brakes. Travers is dead in his seat, a dagger in his heart. Only a few individuals had access to Travers’s compartment, and Kitty must find out which of these seemingly benign passengers is, in fact, a cross-country killer.

December, 1925. A dark, smog-filled London doesn’t seem very Christmassy or exciting, but then Posie Parker, London’s premier female private detective, receives an urgent call from one of her oldest friends: Rufus, Earl of Cardigeon. Summoned to The Mermaid, an ancient hotel in Rye on the Sussex Coast, in the heart of smuggling country, Posie, together with her husband Richard, finds her friend in a real state. As the snow falls and Christmas lights go up, secrets are revealed, and Posie becomes involved in perhaps her most personal case so far.

Autumn, 1921. Lady Eleanor Swift is invited to her old school, St Mary’s, as a guest speaker. Her favorite teacher, Mrs. Wadsworth, has asked that Eleanor talk about her intrepid travels around the globe - travelling the Silk Road by bicycle, crossing the Himalayas and even befriending the Maharaja of India. But in the circumstances, perhaps it would have been a good idea to talk about her career as a daring detective. Because no sooner has Eleanor brushed up on her times tables than she is greeted by terrible news: Mrs. Wadsworth has been murdered.

With the social season just around the corner, the women in Cleo’s family are having new outfits made by the most sought-after designer in the city. Madame Poitiers is bold, self-absorbed, and not French, despite her claims. When Cleo stumbles on her dead body in the salon, she is in a unique position to gather clues and speak to witnesses. But she doesn’t expect to find Harry Armitage’s business card in Madame’s possession. What is the alluring private detective’s connection to the victim? And why is he avoiding Cleo? 

Everyone in Saxford St Peter flocks to Lovelace Sunday, the festival celebrating the romantic history of beautiful Lovelace Manor. This year will be even more exciting, as famous TV historian Cammie Harington is planning a spectacular stunt with a hot-air balloon for her new show. Eve Mallow jumps at the chance to volunteer–it’s a great people-watching opportunity. But she soon realizes there is no love lost between Cammie and the family that owns the manor...so why did Cammie agree to come? When Cammie’s hot-air balloon tumbles from the sky, Eve feels sure this is no accident. 

Discreet sleuth for the high society set Olive Belgrave is delighted with her new flat at South Regent Mansions, where she’s made several friends, including the modern career woman, Minerva, who draws a popular cartoon about a flapper for a London newspaper. But then Minerva comes to Olive for help after catching a glimpse of a disturbing sight - a dead body. At least, that’s what Minerva thought she saw, but there’s not a dead body anywhere in the posh building, and the residents are continuing with their lives as they normally do. Is Minerva seeing things?

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.

Kat brings Harry across the Atlantic to New York for a planned whirlwind time in her home town - complete with a lavish suite at the Plaza. But when Teddy Crowther - grandson of a wealthy City magnate - is snatched by the mob, the pair is asked to help. As Prohibition New York swelters in a heatwave, the Mortimers soon find themselves playing a dangerous game of cat and mouse, not just with the kidnappers, but also the rest of the Crowther family, all of whom have everything to gain - and maybe lose - if Teddy is found ...

When Harry Armitage passes an investigation to Cleo involving adultery, they both think it will end in divorce. But when the client’s wife is found stabbed in her drawing room, it becomes clear that marital problems are only part of the story. As they peel back the lies and expose the sordid details of a marriage in tatters, they see firsthand how gossip and politics fuel the machinations of high society.  

Spring, 1921. Lady Eleanor Swift, explorer extraordinaire and accidental sleuth, hasn’t had a vacation since she arrived in England a year ago. So she books into the Grand Hotel in the fashionable resort of Brighton for some fresh air, fish and chips, and, of course, a dip in the ocean. Eleanor is enjoying her view of the waves and trying to find her bathing suit when calamity strikes: A guest has been found dead at her beautiful hotel. The distraught manager, who can’t afford a scandal, asks Eleanor to solve the case as swiftly as possible.

Winter, 1920. Amateur sleuth Lady Eleanor Swift is feeling festive. She is playing host to the entire village at Henley Hall. She’s also purchased perfect presents for each of her household - not forgetting the biggest bone in the butcher’s shop for her partner in crime, Gladstone the bulldog - and is looking forward to celebrating her first English country Christmas. As snowflakes fall, Eleanor is cheering on contestants in the traditional Christmas fun run in the grounds of the hall. But tragedy strikes when one of the runners drops dead at the finish line.

Posie Parker has been summoned to Chelsea, to the House of Sinne, the fashionable London perfume house. Anouk Sinne, the most brilliant perfumier of her age, has been receiving blackmail demands, and asks Posie to investigate. But is blackmail just the tip of the iceberg? A launch party for the House of Sinne’s highly anticipated new fragrance is just about to take place, and Posie finds herself rubbing shoulders with some very famous people, but after the "reveal" of the strangest perfume Posie has ever experienced, things take a chilling turn for the worse…

Tommy and Evelyn Christie have reluctantly agreed to host the wedding of Tommy's mother to Andrew Parsons, the Marquess of York, at their home Hessleham Hall. None of the happy couple's adult children support the marriage, but when Andrew is found dead outside the wedding chapel on the morning of his wedding, it seems one of them has taken their anger a step too far. To make matters worse, Tommy's younger brother, Harry, is missing and quickly becomes the police's primary suspect. Can Tommy and Evelyn uncover the murderer before the teenage Harry is found and arrested for the crime