now I'm reading Elspeth Cooper's volume 2, Trinity Rising.
I enjoyed the first two but have the third still in my TBR. If you are going to read it we could read it together. 
you could have a read along 
I'll have to check if my library has got book 3, as I don't like them enough to buy (checked - it does).
To be honest, I'm a bit underwhelmed with 2. You normally read after 1 to immerse yourself deeper into the story and the characters, but after 150 odd pages this feels like a completely new book, bar the odd reference to events in 1 - I know you're learning about what came before/during, but I'm not enjoying it much, maybe it's simply the wrong time for it...