Surf cinema may seem at first to be a pretty basic film genre. You watch very good surfers surf on very good waves splashed in with beautiful backdrops, perhaps some requisite travel clips and varying degrees of movement toward some kind of overarching theme.

But surf cinema, especially of the documentary type, can have the same intricacies in storytelling of any other type of film. And that’s the kind of interesting look at the birth of Irish surfing that the viewer will get on Saturday when “Keep It A Secret” makes its New Jersey premiere at the Lighthouse International Film Festival.

www.youtube.com/watch?v=tQKgrHR_78A

This surf documentary tells the story of the earliest days of Irish surfing and how the early evolution paralleled what…