So, our villains foiled my evil plan... by not doing something I (and Thorn) completely expected them to do.
I figured they would try again this last session, so their former master had planned a trap. He's been scrying them pretty much even since they entered his service, and only recently did they put some defenses into place. They would have found information, but it would have been planted and would have led them to a false phylactery trap.
Instead of using their minions to look for information again, though, they used them to make some money and shore up the defenses of their home base. :|
Then when they got the message from Barnabus Thrane about Sir Richard, they harrowed off after that lead. While there, they decided to use the library and some spells that they learned last level to find information on the (true) location of the phylactery.