At last we have a trailer that doesn’t tell us the whole story in two and a half minutes or less. With Ben Is Back, all we have is a two-part mystery: where has Ben (Lucas Hedges) been, and why is he back now, on Christmas Eve (okay, the trailer doesn’t tell you when he’s come back, but that’s when it is; is it relevant? Who knows). It may well be that this is a teaser trailer, and there may well be a further, longer trailer before the movie is released in December, but right now this is a nigh on perfect way to introduce a movie. There are so many questions prompted by this trailer that it’s actually refreshing not to be spoon-fed the answers in advance. Along with where has Ben been, and why is he back now, you could also be asking why he doesn’t have any belongings with him, or why is his sister (Kathryn Newton) so wary of his reappearance? And if she’s wary then why isn’t his mother (Julia Roberts)? Is she just relieved to have him home? And from that, why did he leave in the first place, and how long has he been gone? So many questions, and no answers – yet. Full marks then to the trailer’s creators, and the movie makers who signed off on it. Now let’s hope that further, longer trailer never appears, but if it does, here’s another question: with a teaser this good, would watching a longer trailer that reveals a whole lot more be a good thing? Would it? Would it really?