I'm looking for a book on Algebraic Number Theory, which is somewhat in Analytic spirit. In particular, I want to see the precise connection between
$$\delta_{f}(p)=\{a\pmod p : f(a) \equiv 0 \pmod{p}\}$$ and the L-series
$$\zeta_{K}(s)=\prod_{p: \mbox{prime ideal}}\left(\frac{1}{1-\frac{1}{Np}}\right)$$