The Bloodstone Circle is an elite group of Agents. They are introduced in The Maelstrom, but are feature more heavily in the Red Winter. Where the Red Branch acts as assassins, the Bloodstone Circle seems to be used as bodyguards. When David Menlo asks one of its member's to keep what he has seen and heard confidential, the Agent responds, saying that its members take vows, most likely of secrecy.

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