After Saffron Casson discovers that she's adopted, life is never quite the same again. Her artistic parents and doting siblings adore her, but Saffy wants a piece of her past. So when her grandfather bequests a stone angel to her, Saffy knows she has to find it.

Realising that her childhood in Siena holds the key, she secretly stows away on a car trip to Siena, with her new friend, Sarah. Meanwhile, the rest of her family are engaged in their own wacky projects. Caddy, a hopeless student, is studying for her A Levels and desperately trying to pass her driving test.

Indigo, the sole boy of the Casson family, is determined to rid himself of this fear of heights. And the youngest, Rose, a budding artist, has a knack for baiting her pompous dad, with entertaining results...