Books like Night of the Seventh Moon
Victoria Holt
Night of the Seventh Moon is 360 pages, about 6 hours 36 minutes at 250 words a minute.
12 books to read next
How long each takes
Dark Lover 8.2 h 
Acheron 13.5 h 
The Darkest Night 7.0 h 
Oceans of Fire 6.9 h 
Night Game 7.9 h 
Passenger to Frankfurt 4.6 h 
The Gathering 6.5 h 
The Looking Glass War 4.8 h 
Raintree 5.2 h 
Earth Bound 8.8 h 
Scent of Darkness 7.3 h 
The Darkest Whisper 7.5 h Bar height shows length. Estimated at 250 words a minute.