 Lewis’s original theory of events (1986b) was tailor-made to deal with such cases – or so it might seem. According to that theory, an event is a set of spatio-temporal regions of worlds. We can distinguish between, for example, the event that is essentially Suzy’s theft of a cake (e1) and the event that is essentially her acquiring (one way or another) a coconut cake (e2): the two events consist in two different (but overlapping) sets of spatio-temporal regions of worlds that share their actual-world member, namely what actually happened in the cake shop. And so – at least on the face of it – we can say that e2 was a cause of her illness but e1 was not (since had she not stolen a cake, she would have bought the coconut cake instead).