[Doctor Who E-Books 01] • Summer Falls

"In the seaside village of Watchcombe, young Kate is determined to make the most of her last week of summer holiday. But when she discovers a mysterious painting entitled 'The Lord of Winter' in a charity shop, it leads her on an adventure she never could have planned. Kate soon realises that the painting is a puzzle and with the help of a museum curator's magical cat, a miserable neighbour and a lonely boy she plans to solve it.

And then, one morning Kate wakes up to a world changed forever. For the Lord of Winter is coming and Kate has a very important decision to make."

This book is referred to in the Dr Who episode 'The Bells of St Johns"