Join best friends Millie and Stella for a week of friendship, adventure and a little bit of mystery . . . The first book in an uplifting and inclusive series that celebrates friendship, family, neurodiversity, creativity and a love of animals and books. By the bestselling author of The Tea Chest and The Wonderful Thing about Phoenix Rose. Millie and Stella's very favourite thing is riding their ponies together. But gates are being left open in their paddock, and Millie and Stella are being blamed! Can the girls figure out who is behind the mischief before their beloved ponies are put in danger?