What to read after Detective Watters Mysteries Collection - Books 4-6?

Books 4-6 in Malcolm Archibald's 'Detective Watters Mysteries', a series of crime mystery novels set in 19th century United Kingdom, now in one volume!

The Scuttlers: When Sergeant George Watters is assigned to a scuttling case, he thinks he can solve it in a few days. Instead, he discovers a connection to burglaries across Dundee. After one of Watters' informants tells him that someone from the police force is involved, he realizes that the mystery runs deeper than expected. Can Watters solve the case and bring the burglars, and their accomplices, to justice?

Not a Pukka Gentleman: Sergeant Watters finds himself overwhelmed with three simultaneous cases. With a case of poisoning, a series of child kidnappings and somebody with a seeming dislike to clocks and watches, Watters and his team are stretched thin. Things get even more complicated when a circus comes to Dundee, and Watters has to help raid an illegal gambling den. Fortunately, Dr. Beaton is there to help. But who is the mysterious man who crosses his path in Dundee, and why would anyone wish to kidnap boys from impoverished backgrounds?

A Carriage For Lochee: Already involved in closing down a spate of illegal drinking dens in Lochee and Dundee, Watters is ordered to solve a murder and theft of a carriage from a Lochee merchant. His investigations take him to a family of tinkers and a group of Russian dissidents, as well as back to an incident that occurred in the Crimean War. Together with his partner, Detective Scuddamore, can Watters tie up all the ends in this confusing case?