I read the Jennifer Morgue last year and was blown away. I had the opportunity to pick up this, the first book of the story-line and was excited to jump in.
I actually found this a little more tedious, and a little less fun than the Jennifer Morgue. In fact, around two-thirds of the way trough the book, one story-line resolves, and a new one starts, that feels like it doesn't quite belong. The characters are all the same, but we get reintroduced to some minor players that were already introduces earlier.
Still, if you like the idea that Mandelbrot sets and advanced mathematics can open a rift to another dimension (and who doesn't) there isn't much out there like this. And Bob Howard is a great, nerdy, clueless protagonist that always seems to end up knowing just what to do.