This title, like 'The Last King of Texas' (the third book in the series) starts off with a literal bang. But I found both 'Big Red Tequila' and 'Last King' easier stories to get into than this one was. Once the story starts moving, 'Widower's Two-Step' bears all the hallmarks of the Tres Navarre series: a plot that twists and turns, lots of characters (most with complex and hidden motivations), dramatic fights and confrontations, and truckloads of South Texas character. This book also introduces the Manos Detective Agency -- the employees of which have become regular characters in the Navarre series.
Devotees of the series will definitely want to read this title. I would recommend newcomers start with the first book ('Big Red Tequila') instead of dropping into the middle of the series, like I did. But even on its own merits, this interesting and atmospheric mystery is definitely worth a read or two.