['Too bad your mother isn't here,' she thinks bitingly, grown tired of the gaps in their knowledge even if it's a result of their incomplete memories.]

If it was brought in, then it must obey different rules. There should be some way to bend them... [One shakes her head. No matter. That must be for later--later, once they figure out what to do about this.]

Then the keys have nearly exhausted their use. Is there any sense in pursuing that solution further, or will we have to turn elsewhere for salvation?