Voinov did a great job in giving life to this sci-fi story, the same way in which he built the world in [b:Scorpion|10671271|Scorpion|Aleksandr Voinov|http://d.gr-assets.com/books/1302822836s/10671271.jpg|15580815].
Grimm was quite the character. Up to the bedroom scene, I wasn't ready to join sides with Kyle and think of Grimm as being the morphing Glyrinny. Even with evidence pointing him as the shape changer, I liked him too much to be the wanted fugitive. And what a turn of events when his actions made him the good guy in the story, coming to Kyle's rescue again and again: first by healing his injury, then saving him from Commonwealth's hands.
The plot and world were intricate and lovely to explore. It wasn't your average alien story, so there was a lot of information but that actually helped center the way Kyle and Grimm interacted. There wasn't a lot of emphasis on the romantic development between the two but there was no need as the action and relationship building between the MCs occupied center stage.
My only regret is that "Incursion" ended too soon. I'd love to read more of these two. Easily a 4.5 star rating for this.