A historical fantasy novel set in 1752 when the Julian calendar replaced the Gregorian calendar. It tells the story of Martha, the apothecary's daughter, who is transported to Annwn – the Celtic otherworld – by Madws, a character who controls time and, as she comes to realise, Martha’s own fate. Will she survive the lost eleven days between the calendars?

This multilayered piece of fiction, packed with adventure and humour, also has a visual appeal, featuring illustrations of the icons, plants and recipes that underpin Martha’s work as an apothecary. In the hands of this experienced author for young adults, Madws is an exciting and deeply satisfying read, with broad crossover appeal.