  We study two simplicial complexes arising from a directed graph $G = (V, E)$
with two chosen vertices $s$ and $t$: the *path-free complex*, consisting of
all subsets $F \subseteq E$ that contain no path from $s$ to $t$, and the
*path-missing complex*, its Alexander dual. Using discrete Morse theory, we
prove that both complexes have well-behaved homotopy types -- either
contractible or homotopy-equivalent to spheres.
