  We revisit the issue of causality violations in G\"{o}del's universe,
restricting to geodesic motions. It is well-known that while there are closed
timelike curves in this spacetime, there are no closed causal geodesics. We
show further that no observer can communicate directly (i.e.\ using a single
causal geodesic) with their own past. However, we show that this type of
causality violation can be achieved by a system of relays: we prove that from
any event $P$ in G\"{o}del's universe, there is a future-directed lightlike
path - a sequence of future-directed null geodesic segments, laid end to end -
which has $P$ as its past and future endpoints. By analysing the envelope of
the family of future directed null geodesics emanating from a point of the
spacetime, we show that this lightlike path must contain a minimum of eight
geodesic segments, and show further that this bound is attained. We prove a
related general result, that events of a time orientable spacetime are
connected by a (closed) timelike curve if and only if they are connected by a
(closed) lightlike path. This suggests a means of violating causality in
G\"{o}del's universe without the need for unfeasibly large accelerations, using
instead a sequence of light signals reflected by a suitably located system of
mirrors.
