ISBN-13: 9780099558521 / Angielski / Miękka / 2012 / 256 str.
ISBN-13: 9780099558521 / Angielski / Miękka / 2012 / 256 str.
When Mona Gray is ten, her father contracts a mysterious illness. When she becomes a maths teacher, Mona delights her pupils by encouraging them to find objects that take the form of numbers.