The Spirits of the Attic — Mary Arrigan

Susy attends an auction and buys some old sketchbooks about Heather Grange. That night she wakes up to find a girl in her room, looking at the sketchbooks, who then disappears. Susy decides that she must now visit the shuttered and deserted place to discover if there is some dark secret, and whether the sketchbooks hold any clues.