 What, then, is the cause of an event E? It is not enough for defenders of causation simply to give up the principle “same cause, same effect”. The challenge, according to the dominant cause argument, is to find a criterion that somehow allows us to distill a small set of causes from the complete goings-on on an initial value surface S. And causal skeptics argue that physical theories themselves cannot provide such a criterion. If causes determine their effects, nothing short of the complete state on S will classify as the cause or the set of causes of E. This leaves three options, all of which may seem unpalatable for a defender of causation in physics.