midnight
` The Door which opens into the burying-ground common to us and the Sisterhood of St. Clare ? I have not the Key , but can easily procure it . ' ` You have only this to do . Admit me into the burying-ground at midnight ; Watch while I descend into the vaults of St. Clare , lest some prying eye should observe my actions ; Leave me there alone for an hour , and that life is safe which I dedicate to your pleasures . To prevent creating suspicion , do not visit me during the day . Remember the Key , and that I expect you before twelve . Hark !