I won't summarise the plot, I'll just say I liked it enough to looking for the next book as soon as I turned the last page. You'll have to wait until April though, so don't say I didn't warn you.
Don't be put of by the shallowish feel to the characters at the start, it's a goer from about thirty pages in.
I'm surprised no-one has reviewed this book yet because it's really rather good. There is enough mystery and romance to keep any chicklit or cozy reader happy and the action scenes are tense and well written.
Go on, buy it and read it.