Sinclair's is an establishment very much like Selfridge's, catering to London's rich, offering high fashion, perfumes and sweets.

The series heroines Lilian Rose and Sophie Taylor, accompanied by friends Billy Parker and Joe, are employed on the shop floor and frequently find themselves privy to criminal goings-on.

There, she makes friends with Billy, a junior porter; beautiful Lil, who is one of the department store “mannequins” by day and an aspiring actress by night; and Joe, a shady runaway from the Baron’s Boys, a gang of criminals.

Just before the store is due to open, there is a daring burglary, including the theft of the priceless Clockwork Sparrow.

In this story, we see a young budding artist called Leonora Fitzgerald who goes to an art school in London.

She meets fellow artists Connie who is involved with the suffragette movement, Jack Rose who is Lil's brother.

In The Midnight Peacock, Sophie and Lil find themselves trying to solve a festive mystery at a party in snowy Winter Hall.

Back in London, Mr Sinclair's New Year's Eve Midnight Peacock Ball might just spell disaster for the young detectives and their friends.

Unaware of her passion for solving mysteries, Sophie begins work at the lavish Sinclair’s, where she finds many new friends.

Edward Sinclair - on the surface, a millionaire later to be revealed to be in fact a spy sent by America to investigate Fraternitas Draconum - the Brotherhood of Dragons.