Captain Lacey is asked by Peter Thompson of the Thames River Police to help him investigate a cold case - the murder of a woman found near the docks Thompson patrols. The investigation was sidelined, considered unsolvable, but Thompson has long wished to find her killer. Captain Lacey joins him in the hunt, entering a part of society that is closed to outsiders. Meanwhile, he must deal with his daughter's debut and more developments in his new domestic life, including an anonymous blackmailer who's out to ruin Lacey any way he can.

Captain Gabriel Lacey begins Spring 1818 preparing for a duel. But while he focuses on the affair of honor, darkness, greed, and death stalk the streets of London and bring tragedy to a family Lacey has grown close to. With the aid of Lucius Grenville, London's most famous dandy, and Brewster, a ruffian employed by an underworld criminal, Lacey's investigation takes him to the squalid lanes of Seven Dials, to houses that practice a highly illegal trade, spelling ruin and possible hanging for those caught within.

Captain Lacey stops to assist a young woman in the market at Covent Garden, and realizes to his astonishment that she is his daughter, Gabriella. Lacey then discovers that his estranged wife and her paramour, a French officer, have journeyed to London at the invitation of James Denis to dissolve her marriage to Captain Lacey.

Captain Lacey is drawn into affairs of the highest in the land when his friend Grenville is asked by the Prince Regent to look into odd happenings in his lavish abode of Carlton House.

A Bow Street Runner summons Captain Gabriel Lacey to a Berkeley Square ballroom where a young dandy was stabbed to death during a society ball. The prime suspect: Lacey's former commander, Colonel Brandon. Instead of denying the charges, Colonel Brandon allows himself to be arrested and claims, to Lacey's shock, that the lady he'd stayed protectively near at the ball is his mistress. Lacey realizes that he is the only person not convinced of Brandon's guilt - all present, including Brandon's wife, believe that Brandon committed the murder.

On a cold January night in 1817, former cavalry officer Captain Gabriel Lacey is summoned to the banks of the Thames to identify the body of a young woman. When Lacey looks at the pretty, dead young woman, cut down too soon, he vows to find her murderer.

Captain Gabriel Lacey accompanies famous dandy Lucius Grenville to Egypt, tasked with finding an "object" in Alexandria and procuring it, whatever the cost. The task does not turn out to be so simple. Locating what Denis wants in the teeming city proves difficult, sending Lacey and Grenville exploring tombs and temples down the Nile. Lacey must deal with treasure hunters, a shadow following him and his friends, murder, and missing his new family as he explores the exotic country he has so longed to see....  

After rescuing a lovely woman from an attempted robbery, Captain Lacey discovers that she is the widow of a colonel who'd been accused of murdering an English officer during the Peninsular War. Lydia declares that her husband was innocent and that she knows the true culprits' identities. Intrigued, Lacey, along with his friend, Lucius Grenville, begins to investigate. He soon finds himself mired in scandals of the past and surrounded by murders that are very much in the present.

Cavalry captain Gabriel Lacey returns to Regency London from the Napoleonic wars, burned out, fighting melancholia, his career ended. His interest is piqued when he learns of a missing girl, possibly kidnapped by a prominent member of Parliament. Lacey's search for the girl leads to the discovery of murder, corruption, and dealings with a leader of the underworld.

World War II comes to Farleigh Place, the ancestral home of Lord Westerham and his five daughters, when a soldier with a failed parachute falls to his death on the estate. After his uniform and possessions raise suspicions, MI5 operative and family friend Ben Cresswell is covertly tasked with determining if the man is a German spy. The assignment also offers Ben the chance to be near Lord Westerham's middle daughter, Pamela, whom he furtively loves. But Pamela has her own secret.