There are 9 books in the Master Mercurius Mysteries series. The newest book is Nun Shall Sleep which came out in 2026.

1
Death in Delft

Book cover of Death in Delft
The new historical mystery series you need to get your hands on! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Three missing girls. Only one body. Where are the others? 1671, DelftThree young girls have been abducted from their homes.

The body of…
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2
Untrue Till Death

Book cover of Untrue Till Death
Join Mercurius in another mysterious investigation! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

This time murder has hit close to home… 1674, Leiden, The NetherlandsAfter successfully solving the case of the missing girls in Delft, Master Mercurius has made a name for…

3
Dishonour and Obey

Book cover of Dishonour and Obey
Mercurius is back — and this time he's in England! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

A royal marriage is in the making. But not everyone is happy with the match… 1676, Leiden, The NetherlandsTwo years have passed since Master Mercurius…

4
The Noose's Shadow

Book cover of The Noose's Shadow
It’s another complicated mystery for Master Mercurius to solve! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

A man who nobody liked has been murdered … but who had a motive to kill?

1680, Leiden, The Netherlands

After a successful trip to England…

5
The Vanishing Children

Book cover of The Vanishing Children
Master Mercurius is sent on another complicated mission! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Three Jewish boys are missing … but why is nobody investigating?

1680, Leiden, The Netherlands

The Dutch Stadhouder, William of Orange, has summoned Master Mercurius — and…

6
The Lying Dutchman

Book cover of The Lying Dutchman
Master Mercurius returns to England in another humorous mystery! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Will Mercurius make it out of the English court alive?

1685, The Netherlands

Master Mercurius has once again been summoned to The Hague by Stadhouder William…

7
Murder In Maastricht

Book cover of Murder In Maastricht
Another darkly humorous murder mystery featuring Master Mercurius! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Are the sins of the past threatening the present...?

1686, The Netherlands

After getting Master Mercurius jailed and nearly put to death with one of his schemes,…

8
The Moers Murders

Book cover of The Moers Murders
Follow Master Mercurius in a new European adventure! Perfect for fans of Andrew Taylor, C J Sansom, S J Parris and Ken Follett.

Mercurius is thrown into the thick of it...

1688, The Netherlands

Master Mercurius has just settled back into his life as a lecturer at the University of…

9
Nun Shall Sleep

Book cover of Nun Shall Sleep
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…