Deathwatch and the Death Spectres
I just finished the newly released Deathwatch novel, that features the Deathwatch Talon squad that have been present in several short stories now. Detailing their origins and fleshing out their characters, as well giving much more life to how it is in the Deathwatch. Going right from first initiation.
But most fascinating of all is all the new juicy lore presented on the Death Spectres chapter, scions of Corax. They have some really fascinating things going on, which remains a continued plot thread through the whole of the book, involving the main character Brother Librarian Karras of the Death Spectres from his initiation into the Deathwatch.
I find the book a quite good read, with the smaller space marine focus on just a small squad there is quite a lot more space for interaction and personality. Definitely one of the better recent releases and the book ends on an open note with room for plenty of sequels for Talon Squad and the threads of mystery remaining.