midnight
Sweyn 's coxcombery was always frank , and most forgiveable , and not without fair colour . `` If you want an ally , '' continued Sweyn , `` confide in old Trella . Out of her stores of wisdom , if her memory holds good , she can instruct you in the orthodox manner of tackling a Were-Wolf . If I remember aright , you should watch the suspected person till midnight , when the beast 's form must be resumed , and retained ever after if a human eye sees the change ; or , better still , sprinkle hands and feet with holy water , which is certain death . Oh ! never fear , but old Trella will be equal to the occasion . '' Sweyn 's contempt was no longer good-humoured ; some touch of irritation or resentment rose at this monstrous doubt of White Fell .