As best as I can piece together, the timeline of The Executioner series begins in August of 1968 or 1969. War Against the Mafia was first published in March 1969, and the text of that book refers to events happening in August. The next couple of books also provide some dates but by Nightmare in New York and Chicago Wipeout, we can only infer the dates from the season (both are clearly set in winter). From that point it gets a little trickier. Clearly, this was a decision made by Pendleton to allow the story to unfold without locking it to any particular year; he obviously wasn't writing the books in real-time and the publication dates were getting farther and farther ahead in time from the story dates. Which leads us to Texas Storm.
Published in March 1974, the prologue sets the book in "late spring." As I think about the events of the past 7 books or so, it's hard to get a sense of how much time has passed. The spring immediately following that first winter feels too soon, but it also feels wrong if it's a full year later. Either way, Pendleton is writing this book from at least 3 years into Mack Bolan's future and knows things Bolan doesn't -- specifically, the impending 1973 oil crisis.
Reading these books now, 50ish years after they were published, it's fun to get a time capsule snapshot of what life was like back then. I find it interesting to know where the world was headed and the levels of corruption society would reach that Bolan himself couldn't imagine. But this is next level. In this story, Bolan stumbles onto a Mafia plot to takeover Texas and split it off as its own country in anticipation of a possible oil crisis. It's a James Bond villain level scheme that somehow works here because the author and the reader know what's coming.
So I enjoyed that aspect to the book. In addition, the plot is pretty streamlined, the action is a little uninspired until the end, yet clears the bar overall, the ending isn't especially abrupt, and there's very little Bolan propaganda or philosophizing. Some of the weaker elements include setting up a new Mafia hit team (with the silly moniker, "the Bolan Bunch") to replace the Talifero brothers but then quickly dispatching them by the end of the book; also there's a telephone conversation where Bolan tries to justify his actions to a reporter that's so awkward it feels like it was written by a kid in junior high school.
Overall, it's a quick fun read that didn't make me annoyed, which is better than average for me and this series.