Adventures in Bookland: Carcharadons by Robbie MacNiven
They live in the Void, in the dark beyond the Galaxy’s light, hunting the enemies of the Imperium before they even reach it. There be monsters there, in the dark. But as monstrous as those monsters are the silent hunters, the Space Sharks, the Carcharadon chapter of the Space Marines. For ten thousand years they have cruised the Void, going deep into great silence, on an eternal crusade.
So, yes, they’re pretty weird. Ten thousand years fighting the sort of monsters that inhabit the 40th millennium would make anyone a little bit strange: the Carcharadons are off the scale strange. Perhaps that could have come across a little more strongly in these novels, but Robbie MacNiven does a great job of setting up this chapter of solitary hunters of the abyss in these two novels, the first pitting the Sharks against the Night Lords, the second taking on the Tyrannids.