In this first of a new series of spirited historical mysteries set in 1890s San Francisco, former Pinkerton operative Sabina Carpenter and her partner, ex-Secret Service agent John Quincannon, undertake two apparently unrelated investigations. Sabina's case involves the hunt for a ruthless pickpocket who uses fiendish means to relieve her victims of their valuables. She strikes most often at an amusement park, in a torchlit pitchman’s bazaar, and among the crowds along the evening Cocktail Route. Quincannon is after a slippery housebreaker who targets the homes of the city’s wealthy residents. Following the trail leads Quincannon to the infamous Barbary Coast, an oyster pirate’s lair, and a Tenderloin house of joy. The cast of characters also includes a pair of receivers of stolen merchandise, a retired lady “dip,” an alcoholic lawyer and his wife, a mysterious carriage driver — and a man claiming to be Sherlock Holmes. The two cases eventually connect in surprising fashion, but not before matters are complicated by two murders, assorted felonies, and the constant interference of the bughouse Sherlock — a shrewd “crackbrain” who hinders, exasperates, and nearly outshines both Sabina and Quincannon with clever detective work of his own

Two missing bodies and two separate investigations take Carpenter and Quincannon from the heights above San Francisco Bay to the depths of Chinatown’s opium dens. For John Quincannon, this is a first: searching a Chinatown opium den for his client’s husband, missing in the middle of a brewing tong war set to ignite over the stolen corpse of Bing Ah Kee. Meanwhile, his partner, Sabina Carpenter, unsure of the dark secrets her suitor might be concealing, searches for the corpse of a millionaire, stolen from a sealed family crypt and currently being held for ransom. With the threat of a tong war hanging over the city (a war perhaps being spurred on by corrupt officials), Carpenter and Quincannon have no time to lose in solving their cases. Is there a connection between the two body snatchers? Or is simple greed the answer to this one? And why is the enigmatic Englishman who calls himself Sherlock Holmes watching so carefully from the shadows?

Sabina Carpenter and John Quinncannon are no stranger to mysteries. In the five years since they opened Carpenter and Quinncannon, Professional Detective Services, they have solved dozens, but one has eluded even them: Sherlock Holmes or, rather, the madman claiming his identity, who keeps showing up with a frustrating (though admittedly useful) knack for solving difficult cases. Roland W. Fairchild, recently arrived from Chicago, claims Holmes is his first cousin, Charles P. Fairchild III. Now, with his father dead, Charles stands to inherit an estate of over three million dollars-if Sabina can find him, and if he can be proved sane. Sabina is uncertain of Roland’s motives, but agrees to take the case. John, meanwhile, has been hired by the owner of the Golden State brewery to investigate the “accidental” death of the head brewmaster, who drowned in a vat of his own beer. When a second murder occurs, and the murderer escapes from under his nose, John finds himself on the trail not just of the criminals, but of his reputation for catching them. But while John is certain he can catch his quarry, Sabina is less certain she wants to catch hers. Holmes has been frustrating, but useful, even kind. She is quite certain he is mad, and quite uncertain what will happen when he is confronted with the truth. Does every mystery need to be solved?

For the firm of Carpenter and Quincannon, Professional Detective Services, stopping extortionists is not only grand, but excitingly lucrative. A pleasant afternoon’s bicycling through Golden Gate Park with a friend ends with the revelation of threatening letters, followed by a gunshot in a mansion garden, Sabina Carpenter knows this is a case that demands her immediate and undivided attention. The questions her partner John Quincannon has to unravel are not difficult: Wrixton, a wealthy banker, has met his extortionist’s first demand, but the order to pay another five thousand dollars is too much to face. The banker’s real problem is something he doesn’t want to reveal. That’s was fine with the detective — all he needs to know is that some private letters were involved and Wrixton absolutely needed them back. As with so many of San Francisco’s elite, the bedroom doors never seemed to stay shut. Far more difficult is the matter of the dead courier, murdered most foully in a locked room within a locked room, creating a trail that will take John Quincannon through most of San Francisco’s less savory places and end with a riverboat trip that is anything but a relaxing cruise

A conman always has a bag of tricks, ready to fool the unsuspecting, and almost everyone is unsuspecting until they get taken. When that happens, they turn to Carpenter and Quincannon, Professional Detective Services, to recover their money and what’s left of their dignity, and perhaps even to save their lives. When one such case leaves Sabina Carpenter the only witness to a murder, the family of the culprit vows to stop at nothing to keep her silent. The threat leaves John Quincannon deeply concerned for Sabina’s safety, but there’s no rest for the wicked and so the crime-solving duo must split up to tackle two separate con games, run by two villains with deadly bags of tricks at hand. And when Sabina’s life is put in danger, John must rush to save her while grappling with the terrifying realization of exactly how much she means to him

Carpenter and Quincannon, Professional Detective Services is a fixture in San Francisco at the dawn of a new century. While the future is unclear, Sabina and John know one thing for certain; they will protect their clients from flimflammers, thieves, and murderers, and do whatever it takes to run these dregs of society into the arms of the law. Sometimes, that requires a subtle touch. Professor A. Vargas, self-styled medium extraordinaire, and his partner Annabelle, use guile and trickery to swindle bereaved men and women eager to contact the spirits of deceased loved ones. John and Sabina must not only unmask these charlatans, but also solve the riddle of an impossible murder in the midst of a séance. Other cases involve brute force and personal danger. Such as the theft of a burglarproof safe mysteriously emptied of gold bullion. And John’s pursuit of a ruthless gang of counterfeiters, whose leader appears to be a man from John’s past in the Secret Service — a man thought long dead. Adding spice to these exploits is Sabina and John’s personal relationship, which is rapidly progressing to an exciting new level

In response to a string of gold thefts in a Mother Lode mine, Quincannon goes undercover as a newly-hired miner to identify and capture the men responsible. Meanwhile, Sabina finds herself not only making plans for her and Quincannon’s wedding, but also investigating both an audacious real estate scam and an abusive young man’s villainous secret

Quincannon’s pursuit of two con men who have absconded to Hawaii with a considerable sum of his employer’s assets dovetails nicely with Sabina’s vision of a second honeymoon. But neither is wont to stay out of trouble, and Sabina inadvertently becomes involved in a locked room/dying message murder in Honolulu