The only people who know the secret are those whom the Secret Keeper has told directly, but none of them is able to pass on the information. 知道秘密的人只能是保密人只接告诉的人,但他们都不能把秘密传给别人。
They used the Fidelius Charm to hide themselves, but the person they chose as Secret Keeper, Peter Pettigrew, was actually a spy for Voldemort and betrayed them. 他们用赤胆忠心咒来隐藏自己,可他们选择了小矮星彼得来当保密者。他是个为伏地魔效忠的间谍,后来出卖了他们。