Riley gets a lot better. Ice Station, his second novel, is astonishing, just total, flat out pulp lunacy for five hundred pages. I read it in two days and was knackered afterwards. Area 7, the next one, is equally crazy and if anything bigger. Why they're not movies yet mystifies me.
Oh and go take a look at his website if you haven't yet. There's quite a few of his short stories up there.