Death Without Company is a very interesting book. It starts with Lucien insisting that the dead woman at the retirement community was his wife, and that she was poisoned. Both turn out to be true. 

The investigation into her death goes from complicated to dangerous and back to complicated. Anyone involved in the case seems to be attacked or otherwise in danger of dying, from the granddaughter to the HP officer, from a family practitioner to a retired sheriff. 

As with other Johnson mysteries, the obvious is not the obvious, and there are a few twists involving paternity and who gets to inherit what sort of money, and whether someone is really dead and, if so, who killed them. 

"Not a mystery reader," but this is the second book in the Longmire series, there isn't "character development" per se, the protagonists' characters are relatively established. They are comfortable to read though, engaging and interesting and this second book's plot line was good for showing their characters to advantage. 

Well written, and good descriptions of the history, culture, social issues in the part of the country described.