Status Updates From Паризька справа

I have no clue what's going on here. It's a lot of back and forth. Fin distrusts Gilbert, Fin can't be without him, the next page he can't wait to get rid of him. And we still don't know why Gilbert even appeared in Fin's life and why Fin doesn't wonder that himself. Maybe in the end it all comes together? And it's some kind of murder mystery but the first death happens halfway through the book?

Please, dear Book Gods watching over my tbr: let this be good and entertainjng.
I need something good.