Chuck W. has pulled of that most difficult of things: a sequel that is every bit as good as the original.
If you've not read Blackbirds: (Angry Robot): 1
then I'd say, even though this book stands perfectly well on it's own two feet, it would be better to read that first.
Mockingbird is a gritty urban-fantasy thriller stuffed with good characters, plot, violence, naughty language - the way only Chuck can do foul-mouthed - but very little sex.
The protagonist Miriam, jaded with the idea of settling down, ends up doing 'her psychic thing' for a friend of Louis who works at a school. What starts out as a simple job spirals horribly out of control after she inadvertently touches one of the pupils.
As previously - the character of Miriam is as uncompromising as a brick wall and twice as hard.
If you've already read and enjoyed Blackbirds - you'll not be disappointed. Mockingbird has got everything Blackbirds had: excellent characters, a rocket-propelled plot and plenty of action. But even more than that - this one is at least three shades darker on the colour chart.
I'd definitely recommend it to anyone who likes gritty urban-fantasy.