  We analyze the mass dependence of the chiral condensate for QCD at nonzero
$\theta$-angle and find that in general the discontinuity of the chiral
condensate is not on the support of the Dirac spectrum. To understand this
behavior we decompose the spectral density and the chiral condensate into
contributions from the zero modes, the quenched part, and a remainder which is
sensitive to the fermion determinant and is referred to as the dynamical part.
We obtain general formulas for the contributions of the zero modes. Expressions
for the quenched part, valid for an arbitrary number of flavors, and for the
dynamical part, valid for one and two flavors, are derived in the microscopic
domain of QCD. We find that at nonzero $\theta$-angle the quenched and
dynamical part of the Dirac spectral density are strongly oscillating with an
amplitude that increases exponentially with the volume $V$ and a period of
order of $1/V$. The quenched part of the chiral condensate becomes
exponentially large at $\theta\ne0$, but this divergence is canceled by the
contribution from the zero modes. The oscillatory behavior of the dynamical
part of the density is essential for moving the discontinuity of the chiral
condensate away from the support of the Dirac spectrum. As important
by-products of this work we obtain analytical expressions for the microscopic
spectral density of the Dirac operator at nonzero $\theta$-angle for both one-
and two-flavor QCD with nonzero quark masses.
