Dial a Ghost
by Eva Ibbotson | 
The Abominables
by Eva Ibbotson | 
The Silver Crown
by Robert C. O'Brien | 
The Beasts of Clawstone Castle
by Eva Ibbotson | 
The Woven Path
by Robin Jarvis | 
The Summer Birds
by Penelope Farmer | 
The Time of the Ghost
by Diana Wynne Jones | 
Elidor
by Alan Garner | 
Island of the Aunts
by Eva Ibbotson | 
The Whisper of Glocken
by Carol Kendall | 
The Secret of Castle Cant
by K. P. Bath | 
The Alchymist's Cat
by Robin Jarvis | 
Black Maria
by Diana Wynne Jones | 
The Fatal Strand
by Robin Jarvis | 
Warlock at the Wheel and Other Stories
by Diana Wynne Jones | 
The Dark Portal
by Robin Jarvis | 
The Secret of Platform 13
by Eva Ibbotson | 
Which Witch?
by Eva Ibbotson | 
The Haunting of Granite Falls
by Eva Ibbotson | 
The Haunting of Hiram
by Eva Ibbotson |
The ghosts of Britain need a sanctuary. Castles with central heating, bogs drained for motorways, dismal forests cleared for car parks-there are few places left for a respectable ghost to haunt. Humphrey the Horrible (actually his name is simply Humphrey-he added "the Horrible" to help himself become horrible) is a small, mostly unsuccessful ghost in a family of ghastly ghouls. His mother worries. But Humphrey has enough pluck to befriend a smart, politically aware schoolboy, Rick Henderson, who is willing to take the ghosts' cause right to the top, to number 10 Downing Street-home of the Prime Minister.