This is a mix of 3 starts moments and 5 starts moments. So I ended up giving it 4 stars... 
 I was sometimes super invested in the story, and then there were times, especially around the last third when I really didn't care much... 
 In this book we follow 2 characters: Holder and Miller. I loved Holder and all his crew, I was super invested in everything they were doing. I was not so fond of Miller who just sounded like a basic Noir/Mystery cop character : Middle-age divorced man who drinks a bit too much and is not really at the top of his cop game anymore but is given a case that he will resolve like no other because he has super cop instincts. If I'm not reading mystery/cop novels there's a reason for it so for the first half of the book with Miller chapters I was really waiting for something to change and for scifi to take over. 
 I don't have much more complains. The story was great and really gripping, I had no idea where it was going which is always a good sign. One last thing : I'm not sure why people kept giving all the most dangerous and important mission to a crew that wasn't even military... I'm not sure it's all really realistic but ok ! 
 I'll pick up book 2, even if it's just for Holden (and the rest of his crew who I LOVE but I don't want to give their names cause I consider it spoilery)