Related Clues:

• Book with a lock, maybe
• ''Astrodynamics Takes Off'' - Scotsman and The Daily Record
• Appointment calendar
• Book that may have a lock
• Log some of military raids northwards
• Book written in daily
• Log a builder finally used in home improvements
• Private log
• One of Voldemort’s horcruxes
• Log, for one
• Old record, perhaps?
• Critic perhaps keeps large calendar
• Daily log
• Writing you might keep away from prying eyes
• At first nobody follows blueprint for part of the hospital produced by architect