Somewhat less amusing than the novella introducing the world would lead you to believe.
Not sure about a second Seer going by the name of Mac - thousands of names and you picked that one as a nickname? At least she's teamed with a human.
Pondering a bit. It's a bit of MIB with a side order of errr...things that go bump in the night. The boss's sister has issues and siccs several grendels on Manhattan to send New Year's off with a bang of sorts. Missing is how exactly these beasties were controlled.
The entirety of the book seems to have taken 2 days. Much of it was investigating, either onsite, or in the office, with the last quarter maybe in the hunt for the nest and the adults.