So, to summarise my main plot in just a few sentences (but not just 280 characters), it begins with Joe arriving at a remote Scottish island where a community of male and female young people have established a community where they can be themselves, away from the neut British mainland. For a number of years, an underground organisation called DiG (Different is Good) has been saving 'abnormal' (biologically male & female, rather than neut) foetuses from termination but when the first of them hits puberty, they realise they can't keep them hidden within society anymore.
Joe's life on the island is good, although he's still a bit of an odd one out because, for various reasons there are about 30 girls but only 4 boys. But he settles in and makes friends. Then, on a stormy night, Joe and friend Cain are called on to go out in their boat (they've become the island's fishermen) to rescue a boatload of children whose boat is breaking up on the rocks. One child out of 14 survives, bringing with them a letter from DiG which reveals that the authorities are closing in on their operations.
From an ancient logbook, written by a scientist at the time of the virus which rendered the UK infertile (and led to the engineering of the first neut babies) about two centuries ago, Joe and friends believe, correctly, that beyond Britain's shores, life continues with male and female humans like them being the norm. So Joe, Cain and Nats set out on a journey back to the mainland and across neut Britain, aiming for Dover and then on to France.
The book ends with Joe, alone, reaching France (I won't go into detail, except to say that the other two are both still alive). I've just started writing book 2 which picks up the story.
Also, just to explain, there's a parallel narrative from the PoV of one of Joe's parents, Georgy, starting from the point at which they learn that their foetus needs to be terminated because of an unexplained abnormality. Georgy is briefly reunited with Joe in Dover before helping him to escape on a boat.
Anyone fancy having a go at putting that into 280 characters for me?