[1]The Mystery of the Clockwork Sparrow was Waterstones Children's Book of the Month in June 2015.

[2] The novel was inspired by Katherine's love of classic children's adventure stories, E. Nesbit, Frances Hodgson Burnett, Enid Blyton and Nancy Drew.

There, she makes friends with Billy, a junior porter, and beautiful Lil, who is one of the department store “mannequins” by day and an aspiring actress by night.

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

This detective story is set in an Edwardian department store owned by an enigmatic New York millionaire.