Delirium says:
... would 'Gain access to a secure or locked-down location ' be appropriate now? ...
What location do you have in mind? The only one I can think of, here, would be the underground lair of the hellhound where you all had your bad experiences, it may be possible to get back in there the same way you got in the first time... but does anyone want to?
Otherwise: this Ability is about gaining access, not about finding, so you would need to first find such a place before you can trigger the Move. You could find where you went in last time, but there is no active portal there right now, someone —or something— opened it last time,
you could try do it again.
Delirium says:
... I was thinking of using a variation on Moss's ritual. ...
Quite possibly. Though you don't know his ritual yet, right? Do you want to study the books he sent you, an hour or so ago, and come back? And I am sure you could try something similar if you have seen him do it. (He is trying to make contact, not 'gain access' but I am sure you can pervert his ritual for other ends.:)
Delirium says:
... How about 'study a place of power'? ...
In the park? It is a public place, not sure anyone 'controls it' (though
Max possibly thinks
she does:) so the text of the Move sorta precludes it.
Again, though, I can see this Move being useful during Moss' ritual, if it works and turns his swimming-pool or St James Park into a Place of Power for Wild.