  We study Calabi-Yau manifolds constructed as double covers of ${\mathbb P}^3$
branched along an octic surface. We give a list of 85 examples corresponding to
arrangements of eight planes defined over ${\mathbb Q}$. The Hodge numbers are
computed for all examples. There are 7 rigid Calabi-Yau manifolds and 14
families with $h^{1,2}=1$. The modularity conjecture is verified for all the
rigid examples.
