Cleave by Elizabeth Bear

At last the generation ship Jacob's Ladder has arrived at its destination: the planet they have come to call Grail. But this habitable jewel just happens to be populated already: by humans who call their home Fortune. And they are wary of sharing Fortune - especially people who have genetically engineered themselves to such an extent that it is a matter of debate whether they are even human anymore. To make matters worse, a shocking murder aboard the Jacob's Ladder has alerted Captain Perceval and the Angel Nova that formidable enemies remain hidden somewhere among the new crew.

On Grail - or Fortune, rather - Premier Danilaw views the approach of the Jacob's Ladder with dread. Behind the diplomatic niceties of first-contact protocol, he knows that the deadly game being played is likely to erupt into full-blown war - even civil war. For as he strives to chard a peaceful and prosperous path forward for his people, internal threats emerge to take control by any means necessary.

Originally published in 2011 as Grail.

Elizabeth Bear was born on the same day as Frodo and Bilbo Baggins, but in a different year. This, coupled with a childhood tendency toward reading the dictionary, doomed her early to penury, intransigence and the writing of speculative fiction.

She is a recipient of the John W. Campbell Award for Best New Writer and a Locus Award, and has been nominated for the BSFA, Philip K. Dick and Lambda awards. She lives in southern New England with a presumptuous cat and her hobbies include archery, guitar and the indiscriminate slaughter of defenseless houseplants.