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Another complex case falls in the lap of Master Mercurius! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Mercurius can’t believe his luck … but are things too good to be true?

1689

Master Mercurius is making plans for a holiday tour of cathedrals when a letter arrives from Abbess Mathilde asking for his help.

Her convent has been left a substantial legacy which the abbess plans to use to fill the library, and she would like Mercurius to be in charge of buying the books.

Mercurius has never accepted a mission so quickly.

But as the summer wears on, strange things start to happen in the convent. A precious relic goes missing and an important key is lost.

Mercurius is fairly certain somebody is up to something, but he doesn’t know who and he doesn’t know what.

Desperate to hold on to the dream position he has been given, he finds himself drawn into the mystery.

But is there something more sinister going on…?

Nun Shall Sleep is the ninth historical murder investigation in the Master Mercurius Mystery atmospheric crime thrillers set in seventeenth-century Europe.

• Graham Brack
• Published 1970 January 1st by (first published 2026 January 9th)
• ISBN: 0854958045
• ISBN13: 9780854958047
• Pages
• 4.34 323 ratings
• 24 reviews