Another week, another well-built multi-part doco series about crime in America. In this case, Love Fraud (Showtime / STAN) is about a serial internet dater, Richard Scott Smith, who meets, woos, marries and ultimately fleeces an astonishing number of women in a surprisingly compact area (at least, in the first episode, where most of the women seem to be from Kansas). That he does it time and time again is eyebrow-raising; that what he’s doing is kind-of-legal is pretty astonishing. But the series isn’t really about Smith: it’s about his victims, and their quest for vengeance, as they find each other online, band together, and – with the filmmakers along for the ride – hunt him down. It is this immediacy, of the filmmakers being in the back seat, literally, as their subjects pursue their own story, that makes Love Fraud pretty gripping. What makes it most entertaining is the ally the women enlist: a tough-as-old-boots sixty-something “lady bounty hunter” named Carla who, if you encountered her in a fictional show, you wouldn’t believe. She’s a truly unique character, funny, wise and brave, and emblematically, undeniably American. Indeed, all these shows, from Making a Murderer on, aren’t really about the crimes: they’re about America, and the strange things taken for granted there that play like absurd fiction everywhere else.