Showing A Necessary Evil by Hannah March

The fifth novel in the gripping Georgian mystery series chronicling the adventures of Robert Fairfax. A must-read for fans of historical crime fiction.
To Bath in its Georgian heyday come colourful visitors - the grand, fortune hunters, heiresses, invalids and imposters. Among them is Colonel Sir James Delabole - wealthy, gouty and seeking to make amends for a disreputable past.
When flamboyant Sir James is found poisoned, Robert Fairfax, tutor and amateur sleuth, discovers there is no shortage of suspects. To investigate, Fairfax must enter a murky world of greed, scandal and deception, and he soon finds that the elegant spa is not such a healthy place to be...