It's a warm August morning in 1926 Los Angeles, California. Mercedes Louise Allcutt (Mercy to her friends) is thrilled to be going to her job as secretary to private investigator Ernie Templeton - until she opens the door and discovers her mother on the doorstep. Known to her friends as Honoria and her daughters as The Wrath of God, Mrs. Allcutt is the very last person earth whom Mercy wants to see, barring a couple of coldblooded murderers she's met in the past few weeks.

Transplanted Boston Brahmin, Mercy Allcutt, has had some very exciting times as secretary to private investigator, Ernie Templeton. While it’s true she’s been in what she considers a wee bit of trouble (and Ernie considers out-and-out danger) a time or two, she’s determined to continue learning the ways of the “real” world. However, when she sets out to find her wandering boss, Ernie, one hot September afternoon, she not only discovers a corpse, but she also finds Ernie, bound and gagged. Worse, when the police arrive to investigate the crime, they peg Ernie as the killer.

Former Boston Brahmin Mercy Allcutt is excited to be renting out suites of rooms to deserving working women in her new home on Bunker Hill in Los Angeles. She considers she's performing an act of good-heartedness, no matter skeptical her boss, private investigator Ernie Templeton, is about her endeavor. Mercy not only takes driving lessons from Ernie, but she discovers there's more to being a landlady than meets the eye. Is one of her Angels of Mercy not what she appears to be? Only time, and perhaps Mercy and Ernie, will tell...

Thanksgiving Angels brings Mercy Allcutt and Daisy Gumm Majesty together for the first time when Mercy's parents buy a winter home in Pasadena, CA, and force Mercy to visit for Thanksgiving. To Mercy's shock, Mrs. Allcutt hosts a séance, conducted by Daisy. Mayhem ensues.

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.

Late summer 1933. After a quarrel with too-plucky-for-her-own-good amateur sleuth Kitty Underhay, dashing ex-army captain Matthew Bryant is nursing his wounds, and a tumbler of brandy, when there’s a heavy knock at the door and he finds himself arrested for murder. The body of aspiring actress Pearl Bright has been found, strangled with one of Matt’s own bootlaces, and the evidence seems to be stacked against him. The local constabulary might have locked Matt up, but before they can throw away the key, Kitty hears the news and hies to his aid, determined to prove his innocence. 

Summer 1933. Fresh from the discovery that she has family living nearby, Kitty Underhay has packed her carpet bag, commandeered a chambermaid and set off on a visit to stately Enderley Hall. She’s looking forward to getting to know her relatives, as well as the assembled group of house guests. But when elderly Nanny Thoms is found dead at the bottom of the stairs after papers of national importance are stolen, Kitty quickly learns that Muffy the dog’s muddy paws on her hemline are the least of her problems. 

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.

Lavinia's annual Masked Ball at Mydworth Manor is a highlight of the season, as locals mingle with the great and famous from London. But the lavish party comes to a full stop when one of the guests is found dead down by the lake. It seems it's a clear case of a heart attack. But Harry and Kat suspect that the dead man in a mask was in fact the victim of a clever case of murder. And the killer's work at the party is not yet done... Nathaniel Parker, born in 1962, graduated from the London Academy of Music and Dramatic Art and went on to join the Royal Shakespeare Company.

June 1933. Independent, young Kitty Underhay has been left in charge of her family’s hotel, The Dolphin, on the tranquil English coast. But when several rooms are broken into and searched, including Kitty’s own, she quickly realizes that something out of the ordinary is afoot at the hotel. Soon, rumors are flying in the cozy town that someone is on the hunt for a stolen ruby. A ruby that Kitty’s mother may well have possessed when she herself went missing during the Great War.

Sussex, England, 1929. Mydworth is a sleepy English market town just 50 miles from London. But things are about to liven up there, when young and handsome Sir Harry Mortimer returns home from his diplomatic posting in Cairo, with his beautiful and unconventional American wife, Kat. No sooner have the two arrived, when a jewel robbery occurs at Harry's aunt's home - Mydworth Manor. The police are baffled and overwhelmed with the case. But Harry and Kat have an edge in the hunt for the dangerous culprit.

England, 1920. Lady Eleanor Swift, adventurer extraordinaire and reluctant amateur detective, is taking a break from sleuthing. She’s got much bigger problems: Eleanor has two left feet, nothing to wear and she’s expected at the masked ball at the local manor. Her new beau Lance Langham is the host, so she needs to dazzle. Surrounded by partygoers with painted faces, pirates, priests and enough feathers to drown an ostrich, Eleanor searches for a familiar face. As she follows a familiar pair of long legs up a grand staircase, she’s sure she’s on Lance’s trail. 

Lucille Abbey runs her London secretarial agency with utmost efficiency. When, therefore, a certain Professor Hallam rejects three girls sent by her to apply for the post of his secretary and they each pronounce him "impossible", Lucille herself sets out to interview the Professor at his home in Hampshire. He is, she finds, eccentric—even impossible; but he represents a challenge and, what is more, an excuse to delay what promises to be a trying holiday in Paris. She stays on to tame and to organize him—a less formidable task than she had imagined; in fact, she grows fond of him.

London,1925. Scotland Yard Detective Inspector Devenand Hunter finds himself in the middle of a series of upper-class deaths in London. Bright young people are being extinguished in their favorite night spots, from a sleazy private jazz club to the Savoy ballroom. Dev knows just the person to help him navigate the treacherous society waters: Lady Adelaide Compton, a marquess's daughter and widow of a Great War hero. Unfortunately, he has put her in jeopardy once before, nearly leading him to turn in his warrant card.

After a car accident ended her medical career before it even started, Cassie moved to London on a whim, expecting to see the sights and live the typical tourist backpacker lifestyle. Instead she finds herself accompanying a French private detective, Violet Despuis, as they attempt to find out who poisoned four people in the middle of London. Cassie's life soon includes this crazy detective, an ancient landlady with a curious past, a mischievous orange cat who likes going for walks on a leash, and a super hot pathologist that Cassie is sure is out of her league.