Three missing girls. Only one body. Where are the others? 1671, Delft Three young girls have been abducted from their homes. The body of one has been found in a shallow grave. The other two are still missing. The murder has shocked everyone in the peaceful city of Delft, and the mayor is...

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 that is never good news. Mercurius has gained a reputation for himself with William for successfully undertaking...

Master Mercurius has once again been summoned to The Hague by Stadhouder William of Orange. And a letter from William is never good news. King Charles II of England has died and William, with his wife Mary, is now next in line to the throne once the current king, James II dies.

This time murder has hit close to home.... 1674, Leiden, the Netherlands After successfully solving the case of the missing girls in Delft, Master Mercurius has made a name for himself as a private investigator. With unrest occurring both nationally and internationally, William of Orange is...

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 to secure the Princess Mary's hand in marriage to William of Orange, Master Mercurius is back at the University of Leiden. And once more, he finds himself...

1676: Stadhouder William of Orange wants to marry. And he has his sights set on Princess Mary, the niece of King Charles II of England. William has decided that Mercurius, as a minister, is the perfect person to travel to England and secure the hand of the princess on his behalf....

1688, The Netherlands. Master Mercurius has just settled back into his life as a lecturer at the University of Leiden when he is once again summoned by the Stadhouder, William of Orange.

After getting Master Mercurius jailed and nearly put to death with one of his schemes, the Stadhouder, William of Orange, has finally left Mercurius in peace.

What do you do when the poison comes from within…? Prague, Czech Republic The body of a young woman is found strangled by the side of the road.