It's 1953, just days from the coronation of Queen Elizabeth, and Penny Black can't get into the summer holiday spirit. Not when she's about to move to Scotland - and away from everything she knows - for good.

But when Wishyouwas plops into the fireplace in a cloud of soot and chaos, with a summons from the Royal Postmistress herself, all of Penny's plans suddenly go up in smoke.

The intrepid pair are soon on the trail of a mysterious traitor and a potentially deadly plot to halt the coronation. Their investigation will take them across London's busy streets, high up in the air and deeper into danger than they've ever been before .

Alexandra Page spent her early childhood being airmailed between England and Zimbabwe and making up stories to entertain her younger siblings. After studying English Literature at University College London, she worked for several years in book production and then in the City, before venturing into writing. Alexandra loves being creative, travelling to far-flung places and swimming in anything bigger than a puddle. She lives in London with her husband and daughter.

Penny Neville-Lee studied for a Painting MA at the Royal College of Art. After several years making large oil paintings of gloomy woods in the company of Radio 4 and some studio mice, she had her small son, shifted to the kitchen table and realised there might be something in those doodles after all. Penny is inspired by small people, bright colours, a blank page and newly sharpened pencils. She lives in Manchester with her two children, husband and very adventurous cat.