Sephy and Callum have been best friends since childhood, and now they are older and they realise they want more from each other.
But the harsh realities of lives lived in a segregated society are beginning to take their toll: Callum is a nought - a second-class citizen in a world dominated by the Crosses - and Sephy is a Cross, and the daughter of one of the most powerful men in the country.
The barriers they would have to cross to be together at first seem little more than minor obstacles to the two idealistic teenagers, but soon those barriers threaten not only their friendship but their lives.
Scientists are appealing for more people to donate their brains for research after they die.
Life on Earth may have arrived from Mars on an asteroid, scientists have claimed.
Lunar mission scheduled at the end of 2017 could find out if beer can be brewed on the moon.
A bottle used to teach children how far litter can travel ended up on Scottish beach after 8,700-mile journey.
Confused Apple customers are finding coins in their MacBooks.
High levels of iron help prevent hearing loss, a study has claimed.
A software engineer has constructed a fingernail-sized engine made of paper and it totally works!
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