In these two dramas, she puts her extraordinary mind to work investigating cases of disguise, dismemberment, mayhem and murder. In Speedy Death, a country house in the 1920s is rocked by a murder which takes place in a room which is first locked, then later unlocked. As fingers point and the suspects begin to turn on each other, another death occurs. Then The Mystery of a Butcher's Shop sees Mrs Bradley investigating as a headless body is found in the butcher's shop.

In a gloomy flat off Islington High Street, Chief Inspector Brett Nightingale and Sergeant Beddoes find an old woman dead. The Princess Olga Karukhin, who fled from Russia at the time of the Revolution, has lived in terror of being discovered ever since. Olga's grandson, Ivan, appears to have run from the scene but is later seen returning to the flat as though oblivious to the terrible crime. Taking place between 22nd and 24th December, Nightingale's enquiry takes him across London, culminating in the wrapping up of the mystery on Christmas Eve. 

Lord Comstock is a barbarous newspaper tycoon with enemies in high places. His murder in the study of his country house poses a dilemma for the Home Secretary. In the hours before his death, Lord Comstock’s visitors included the government Chief Whip, an Archbishop, and the Assistant Commissioner for Scotland Yard. Suspicion falls upon them all and threatens the impartiality of any police investigation. Abandoning protocol, the Home Secretary invites four famous detectives to solve the case: Mrs Adela Bradley, Sir John Saumarez, Lord Peter Wimsey, and Mr Roger Sheringham. 

Bruce Attleton dazzled London’s literary scene with his first two novels, but his early promise did not bear fruit. His wife, Sybilla, is a glittering actress, unforgiving of Bruce’s failure, and the couple lead separate lives in their house at Regent’s Park. When Bruce is called away on a sudden trip to Paris, he vanishes completely until his suitcase and passport are found in a sinister artist’s studio, the Belfry, in a crumbling house in Notting Hill, and Inspector Macdonald must uncover Bruce’s secrets. This intricate mystery from a classic writer is set in a superbly evoked London of the 1930s.

March, 1925. Pregnant, bored, and longing for an adventure, Posie Parker accepts a rather last-minute wedding invitation from an old friend who is getting married out in the gorgeous town of San Gimignano, Tuscany. But what Posie - and her husband Richard Lovelace - arrive into is not a blissfully happy wedding party, at all. It’s a chaotic mix of mistrust, unfaithful fiancées, bizarre death threats, uninvited wedding guests, and a big dollop of very real unease.

Richard Temperley arrives at Euston station early on a fogbound London morning. He takes refuge in a nearby hotel, along with a disagreeable fellow passenger who had snored his way through the train journey. But within minutes the other man has snored for the last time - he has been shot dead while sleeping in an armchair. When the police arrive, Detective Inspector James discovers a token at the crime scene: 'a small piece of enamelled metal. Its colour was crimson, and it was in the shape of the letter Z'.

For the most part, the dead man received public sympathy. A decent, hardworking chap, with not an enemy anywhere. People were surprised that anybody should want to kill Jim. But Jim has been drowned in the Dumb River, near Ely, miles from his Yorkshire home. His body has been discovered before the killer intended – disturbed by a torrential flood. It's up to Superintendent Littlejohn of Scotland Yard to trace the mystery of the murder to its source, leaving waves of scandal and sensation in his wake.

Evelyn Christie has resigned herself to another long, boring weekend at Hessleham Hall, the home of her husband, Tommy's, family. However, it turns out to be anything but dull when his uncle, the Earl of Northmoor, is shockingly murdered! Evelyn must use all of her sleuthing knowledge, gained whilst she was a member of the Police force during the war, to find out who the murderer is before the bungling local police force decide the Earl was bumped off so Tommy could inherit his title.

"The horror on the train, great though it may turn out to be, will not compare with the horror that exists here, in this house." On Christmas Eve, heavy snowfall brings a train to a halt near the village of Hemmersby. Several passengers take shelter in a deserted country house, where the fire has been lit and the table laid for tea - but no one is at home. Trapped together for Christmas, the passengers are seeking to unravel the secrets of the empty house when a murderer strikes in their midst.

On a fine autumn weekend Lord Aveling hosts a hunting party at his country house, Bragley Court. Among the guests are an actress, a journalist, an artist and a mystery novelist. The unlucky 13th is John Foss, injured at the local train station and brought to the house to recuperate - but John is nursing a secret of his own. Soon events take a sinister turn when a painting is mutilated, a dog stabbed and a man strangled. 

It's 1920, and Christmas is coming. Major Lennox finds a body on his doorstep - why on his doorstep? Was it to do with the Countess? Was it about the ruby necklace? Lennox goes to Melrose Court, home to his uncle, Lord Melrose, to uncover the mystery. But then, the murders begin, and it snows, and it all becomes very complicated.

Amateur sleuth Mordecai Tremaine is back in another classic mystery from the author of Murder for Christmas. When Mordecai Tremaine emerges from the train station, murder is the last thing on his mind. But then again, he has never been able to resist anything in the nature of a mystery - and a mystery is precisely what awaits him in the village of Dalmering.

Amateur thief Ted Lyte has chosen an isolated house by the coast for his first robbery. But Haven House is no ordinary country home. While hunting for silverware to steal, Ted stumbles upon a locked room containing seven dead bodies. Detective Inspector Kendall takes on the case with the help of passing yachtsman Thomas Hazeldean. The search for the house's absent owners takes Hazeldean across the Channel to Boulogne, where he finds more than one motive to stay and investigate.

In Bloomsbury, London, Inspector Brook of Scotland Yard looks down at a dismal scene. The victim of a ruthless murder lies burnt beyond recognition, his possessions and papers destroyed by fire. But there is one strange, yet promising, lead - a lead which suggests the involvement of a skier. Meanwhile, piercing sunshine beams down on the sparkling snow of the Austrian Alps, where a merry group of holidaymakers are heading towards Lech am Arlberg. 

England, 1924. Lady Adelaide Compton has recently (and satisfactorily) interred her husband, Major Rupert Charles Cressleigh Compton, hero of the Somme, in the family vault in the village churchyard. Rupert died by smashing his Hispano-Suiza on a Cotswold country road while carrying a French mademoiselle in the passenger seat. With the house now Addie's, needed improvements in hand, and a weekend house party underway, how inconvenient of Rupert to turn up - not in the flesh, but as a spirit! Rupert has to perform a few good deeds before becoming welcomed to heaven.