If you are in my campaign (Morpheus) please do not read this thread. Thank you. 
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For the first adventure for my new Ral-Auth (tm) Campaign I am going to have the PCs, who all belong to a noble house, to be meeting with their entire extended family for a great party in a manor house outside of the player's home city of Seleresor.
While the PCs are out on a social hunt the manor is going to be attacked by a large mercenary company who will succeed in wiping out pretty much the entire House but in the proccess be destroyed themselves. The PCs will be able to avoid this due to their hunt. Thus thrusting them into leadership positions in their House and preparing them for the campaign to follow.
The individual behind this dastardly deed, at least on a local level, is an eryines rogue who leads the local chapter of the Six Barrels Cosnortium.
My query is this, how do you suggest I ensure that the eryines can avoid detection by some of the magic that the House's allies might be able to call upon to learn her identity.
I already figured that it would be wise to have her polymorphed and to own an amulet of proof against detection and location, but is there anything else that could aid this? Assume that the largest resource the House will be able to tap is 5th level spells/powers.

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For the first adventure for my new Ral-Auth (tm) Campaign I am going to have the PCs, who all belong to a noble house, to be meeting with their entire extended family for a great party in a manor house outside of the player's home city of Seleresor.
While the PCs are out on a social hunt the manor is going to be attacked by a large mercenary company who will succeed in wiping out pretty much the entire House but in the proccess be destroyed themselves. The PCs will be able to avoid this due to their hunt. Thus thrusting them into leadership positions in their House and preparing them for the campaign to follow.
The individual behind this dastardly deed, at least on a local level, is an eryines rogue who leads the local chapter of the Six Barrels Cosnortium.
My query is this, how do you suggest I ensure that the eryines can avoid detection by some of the magic that the House's allies might be able to call upon to learn her identity.
I already figured that it would be wise to have her polymorphed and to own an amulet of proof against detection and location, but is there anything else that could aid this? Assume that the largest resource the House will be able to tap is 5th level spells/powers.