There's a guy named Felix Caster (what IS it with serial-modern-fantasy authors and ridiculous names? It's like newscasters and terrible puns!) who exorcises ghosts for a living. This is a convenient talent to have, it turns out, since the world was positively overrun with the buggers a few years back and they can really be a hassle. He's out of the game now because he did Something Bad, and because all of the best heroes are reluctant heroes and coming out of retirement earns you hero-bonus points. Aaaanyway he needs some cash to help a friend so he takes a job, it turns weird and the mob gets involved and he gets his ass kicked by one person after another until in the end he uses his Clever Clever Brain to outwit the badguys, save the day, find and lose a lover, and still get paid (or not).
If this sounds an awful lot like Harry Dresden, you'd be pretty spot on. The primary difference is that this is British. It was enjoyable and I'll probably pick up more, but I keep saying that about ol' Harry too, and time is making a liar of me. When it comes right down to it, these books all feel the same and while I enjoy them while I read them, it's hard to feel motivated to pick up another. This series might be more likely to catch my interest because I get to decipher obscure London-isms while I read it, and it left me with an intriguing next book hook. If you loves you some Dresden Files, this is absolutely worth a look.