People often ask what is the best sequence in which to read my books. This is a good question, because at this point all my published books take place in the Diffusion universe (although I have an upcoming series that will be unrelated). The order in which you read them can certainly impact the way you perceive the overall story. There are two reasonable sequences:
If you want to read them in chronological order of the events that take place, you should read them as follows (from left to right):
And then, logically, you would read Profusion when it comes out later this summer.
Or, you could read them in the order I had originally intended (think of this as the Director's Cut):
And then you would read the upcoming Profusion after Blue Arrow. I personally like this sequence because it gradually reveals information in a way that appeals to me. For example, even though Savage takes place in 1868, long before Diffusion, it is a part of the story you will appreciate more if you have read Diffusion and Infusion. The same could be said for Blue Arrow.
But regardless of what order, the important thing is to read them! You can get them all here: