When magistrate Patrick Colquhoun orders a habitual thief and ne'er-do-well transported to Botany Bay, he doesn't realize a 14-year-old boy has been left behind to follow in his father's footsteps - not until young John Pickett is hauled into Bow Street for stealing an apple from the produce market at Covent Garden. Feeling to some extent responsible for the boy, Mr. Colquhoun prevails upon Elias Granger, a prosperous coal merchant, to take him on as an apprentice.

Haughty Lady Helen Radney is one of London's most beautiful women, and the daughter of a duke, but her sharp tongue has frightened away most of her suitors. When her father gambles away his fortune, the duke's only chance for recouping his losses lies in marrying off Lady Helen to any man wealthy enough to take a bride with nothing to recommend her but a lovely face and an 800-year-old pedigree.

The eighth book in the series finds John Pickett bound for England's scenic Lake District, where an unsigned letter has summoned him for an unspecified reason. Pickett and his wife Julia, the former Lady Fieldhurst, take a room at the Hart and Hound as the letter instructs him. Once installed there, however, Pickett can do nothing but wait for the anonymous contact to identify himself. A midnight search of the inn's register seems to identify the innkeeper, Ned Hawkins, as his man, but before Pickett can discover the reason for his summons, Hawkins is pushed from a cliff - surviving the fall only long enough to call Pickett's attention to the letter in his pocket.

When one of his colleagues witnesses a robbery in which one of the participants, a child, bears a striking resemblance to a certain Bow Street Runner, John Pickett realizes he has a young half-brother who has been “apprenticed” to a criminal gang. The brutal murder of the pursuing constable makes the crime far more serious than a simple robbery would be - and 10-year-old Kit is linked to the crime by the toy soldier he dropped while fleeing the scene.

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.