If every scrap of circumstantial evidence points in one direction, and not one points in any other direction, then circumstantial evidence alone can lead to conviction.  In fact, given some of the frailties of humans in giving viva voce evidence, let alone deliberate perjury being a possibility, circumstantial evidence can be more reliable, particularly when there is a lot of it.  Let's look at the judgment which, on appeal, the Nova Scotia Justice will be required to prepare.