The Target Is H sets all of this up within the first few pages, with Hardin a battered shell returning home from 'Nam, unsure what to do with his life. Therefore it's a bit jarring that the next chapter opens up 7 months later, with Hardin now living in a secluded desert fortress with a "mad scientist" named Willard Haskins and an American Indian named David Red Chief, plotting a three-man war on the Mafia.
Even the reasons for this war are glossed over -- Hardin fell in love with Professor Haskin's niece Donna, who spurred Hardin to research the reasons behind his old high school football injury. It turns out that the guy who hurt Hardin was a low-tier mobster; this revelation lead the two of them further on until they somehow ran afoul of Don Pietro Scarelli, local mob boss, who had Donna killed in a car crash. (Again, all of this is rendered in elliptical flashbacks strewn through the main narrative; Donna doesn't even appear in the narrative, which is unfortunate when you realize that her love for Mark and her murder are the two factors in his genesis as the series hero.)
Hardin relies on his 'Nam penetrating skills to wage an effective war on Scarelli's mobsters. There are a few Mafia factions in the city and Hardin hits each of them so that soon they think one faction is battling another. Hardin's got a host of weaponry, most of it culled by Haskins, some of it developed by the Professor himself, such as a dart which can render a man to a death-like state for a few moments.
The battles are mostly one-sided, with the goons no match for Hardin's skills. Regardless the action sequences are all well staged and expertly rendered, particularly a great scene where Hardin gets a small army of mobsters stuck in a canyon and lobs white phosphorous down upon them. This is probably the most brutal treatment I've ever seen delivered to the mob in a men's adventure novel! But other than that there are a lot of running battles, with Hardin blasting away thugs with various automatic weaponry.
Hardin isn't the superhero typical of these types of novels. He has past injuries which he's still trying to overcome, and despite the horrendous losses he inflicts upon his enemies there are still many times in which he himself is in mortal danger. There's another great sequence where, barely able to move due to his injuries, Hardin has to scale a cliff in pitch-black darkness, escaping an assembled army of mobsters and police.
Character development is minimal, which again is a shame -- a "regular" novel would've centered solely upon Hardin's recovery of his body and psyche, whereas this one cuts past all that stuff just to get to the gory action. (That's not a bad thing...I'm just saying.) But you get to like these characters, and you look forward to reading about more of their adventures in future installments.