The Body on the Doorstep by AJ Mackenzie is an excellent historical mystery. Set in the Romney Marshes at the end of the 18th century the plot combines a murder, the local community of smugglers, the corrupt and dysfunctional customs services with the threat of a French invasion. Smugglers, spies and toss in a drunken vicar as a detective.
This is an enjoyable read, lots of interesting historical detail, engaging characters and plenty of twists to the plot. There is definitely potential for a series based on these characters and setting, I would like to read more.