I think we're planning to. For better or for worse, they seem to trust us, so we might as well use that to our advantage.

As for why we think it's them... there was that note from last week about golden waterfalls and honeyed words. Emeralds and sapphires. Pretty accurate descriptions, don't you think?

[...]

Also, I can tell you something else: that note from William was meant specifically for Phil. Before he was executed, the two of them worked out a code involving the clock face so they'd have a way to communicate in secret without anyone else knowing what that was about.