Molly Murphy Sullivan's husband, Daniel, a police captain in turn-of-the-century New York City, is in a precarious position. The new police commissioner wants him off the force altogether. So when Daniel's offered an assignment from John Wilkie, head of the Secret Service, he's eager to accept. Molly can't draw any details of the assignment out of him, even where he'll be working.

Molly and Daniel Sullivan are settling happily into the new routines of parenthood, but their domestic bliss is shattered the night a gang retaliates against Daniel for making a big arrest. Daniel wants his family safely out of New York City as soon as possible. In shock and grieving, but knowing she needs to protect their infant son, Liam, Molly agrees to take him on the long journey to Paris to stay with her friends Sid and Gus, who are studying art in the City of Light.

Molly Murphy Sullivan's husband, Daniel, a captain in the New York City police force, is stumped. He's chasing a murderer whose victims have nothing in common - nothing except for the taunting notes that are delivered to Daniel after each murder. And when Daniel receives a note immediately after Molly and her young son, Liam, are in a terrible train crash, Daniel and Molly both begin to fear that maybe Molly herself was the target.

It's Christmastime in 1905 New York City, and for once Molly Murphy Sullivan is looking forward to the approaching holidays. She has a family of her own now: She and Daniel have a baby son, and 12-year-old Bridie is living with them as their ward. As Molly and the children listen to carolers in the street, they hear a lovely voice, the voice of an angel, and see a beggar girl huddled in a doorway, singing "Away in a Manger". Bridie is touched by the girl's ragged clothes and wants to help her out if they can.

Molly Murphy - now Molly Sullivan - is a year into her marriage, expecting her first child, and confined to the life of a housewife. She’s restless and irritable in the enforced idleness of pregnancy and the heat of a New York summer in 1905. So when a trip to the post office brings a letter addressed to her old detective agency asking her to locate a missing Irish serving maid, Molly figures it couldn’t hurt to at least ask around, despite her promise to Daniel to give up her old career as a detective. On the same day, Molly learns that five babies have been kidnapped in the past month.

Georgie's best friend, Belinda, inherits a spooky old house in Cornwall and asks Georgie to go with her to inspect the property. When they arrive, they meet Rose, a woman Belinda knew as a child when she spent her summers with her grandmother in Cornwall. Belinda never liked Rose, who has always been bossy and a bit of a bully, but when Belinda's house proves to be uninhabitable, Rose invites them to stay with her. Rose is now married to Tony Summers, Belinda's childhood crush, and lives in the lovely house on the cliffs that he has inherited.

With Molly Murphy’s wedding to NYPD Captain Daniel Sullivan quickly approaching, the Irish P.I. heads to the Westchester County countryside,where Daniel’s mother can counsel her on a bride’s proper place. Surprisingly, Molly seems to be agreeing with her future mother-in-law’s advice. Molly promises to leave her detective work behind and settle down after becoming Daniel’s wife…but she isn’t married yet. So when she gets word of a possible case, Molly sneaks back into the city to squeeze in a little more sleuthing before the wedding bells can ring.

Irish immigrant and private detective Molly Murphy is thrilled to have a ticket to see world-famous illusionist Harry Houdini. But before he can even take the stage, the opening act goes horribly wrong—and the sensational Signor Scarpelli’s lovely assistant is sawed in half. In the aftermath, Scarpelli accuses Houdini of tampering with his equipment. Who else but the so-called Handcuff King could have got a hold of his trunk of tricks, which he keeps under lock and key?

Irish immigrant Molly Murphy and her New York City P.I. business are in the midst of a sweeping influenza epidemic and a fight for women’s suffrage that lands her in jail. Her betrothed, Police Captain Daniel Sullivan, finds her, but he hardly has time to bail her out, what with Chinese gangs battling for control of a thriving opium trade. The only consolation Molly can take from her vexing afternoon in the clink is that it made her some new friends among the Vassar suffragists - and brought her a pair of new cases.

A woman private eye in a man's world, Molly Murphy is having a hard time succeeding as a New York shamus. That's why she agrees to go undercover for the NYPD to expose a pair of spiritualist sisters as con-artists even though the offer comes from police captain Daniel Sullivan. Sullivan had once won Molly's heart - until she discovered he already had a socialite fiancée and an upcoming wedding. Now Molly's masquerading as a cousin from Ireland at the Hudson River mansion of Senator Barney Flynn. Flynn's invalid wife hopes the psychic sisters can contact her dead son, kidnapped and lost in a sensational crime.

It’s wintertime in New York, and for the first time since Irish immigrant Molly Murphy started her early-twentieth-century detective agency, she is completely snowed in with work. While she’s proving to be quite the entrepreneur and is very much in demand by some of Broadway’s brightest stars and Fifth Avenue’s richest families, she has to grudgingly admit that if she’s going to work more than one case at a time, then she’s going to need some help.

In turn-of-the-century New York City, Irish immigrant Molly Murphy is contemplating giving up PI work for something a little less complicated, less exciting. Molly has had quite enough excitement recently, thank you very much. Especially from the handsome but deceptive NYPD captain Daniel Sullivan, whom she'd like to avoid completely. But when Daniel is accused of accepting bribes and lands himself in the Tombs, the notorious city jail, he begs Molly to help prove he was framed, and after everything they've been through, she cannot turn him down.

Evan Evans is a young police constable who has traded in the violence of city life for idyllic Llanfair, a Welsh village tucked far away from trouble. Nestled among the Snowdonia mountain range, Llanfair looks to Constable Evans like a town forgotten by time, but he quickly learns that even the bucolic countryside has its share of eccentric - and deadly - characters.

Molly Murphy is starting to think the cards are stacked against her. She's determined to be a private detective, but hampering her investigations is the fact that she's finding many places in turn-of-the-century New York City where women are not welcome, something that's as frustrating to her fiery Irish pride as it is to her rapidly emptying pocketbook. Then two business opportunities pop up simultaneously. An aristocratic family in Dublin fears their daughter has fled to the New World with her unsavory boyfriend, and they hire Molly to track the two down and send the young woman back home.

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.