This is an article which gives an intriguing opening premise, and slowly, pulls the wrap, engulfing you in its multi-tiered story along the way. I was interested in Halloway, then the Order, then by Calvin's position in the Order and his relation to Evelyn. The lead-up to that ultimate point kept me hooked.
However, I was less interested in the idea that Calvin, too, does not exist — and even less so when the same was revealed of Miranda. This entry's framing is successful to the extent that, as you are led to believe these fictional/missing events are truths, you become more invested. But I think the effectiveness of that framing is stripped away when it works conversely to that, which this entry also does. An ideal version of this piece, to me, would be one which doesn't go one stage further in declaring it all a fiction again.
That said, this is largely an enjoyable piece — so good work!