Orphans of the Kraken

With their Chapter all but destroyed by the monstrous tyranids of Hive Fleet Kraken, Space Marines of the Scythes of the Emperor infiltrate a tyranid bioship in search of the gene-seed of fallen battle brothers. But the deeper they get into the living vessel, the more they realise that something is wrong, and more than just deadly bio-creatures lurk in the foetid interior of the ship.