Anna hasn't a friend in the world - until she meets Marnie among the sand dunes. But Marnie isn't all she seems...

Sent away from her foster home one long, hot summer to a sleepy Norfolk village by the sea, Anna dreams her days away among the sandhills and marshes.

She never expected to meet a friend like Marnie, someone who doesn't judge Anna for being ordinary and not-even-trying. But no sooner has Anna learned the loveliness of friendship than Marnie vanishes...