The Midnight Hour

"When strange late-night letters start arriving at home, Emily's parents set off to investigate. But when her parents disappear completely and Emily is left home alone to face the weird strangers that begin to appear at her door, she takes all of the clues at her disposal and makes for the place where the letters came from--the mysterious Night Post. What she'll discover is the secret world of the Midnight Hour--a Victorian London frozen in time, full of magic and monsters"--Dust jacket.