Intention purifies the action! Some indiscretions are tolerated in the interest of truth, such as: searching without a warrant, reading the Clarke's correspondence, and opening a parcel addressed to Thora Grey.
Is your mind playing tricks on you? You are taking the curse of the dragon seriously and you are accusing Thora Grey of black magic! Do not let your imagination run wild, it's unworthy of Hercule Poirot.