Nor was that the worst of it. For when Rudolph Musgrave followed her—as he presently did, in a state of considerable amaze,—his sister informed him that Miss Stapylton had retired to her room with an unaccountable headache.  
And there she remained for the rest of the evening. It was an unusually long evening.
 
Yet, somehow, in spite of its notable length—affording, as it did, an excellent opportunity for undisturbed work,—Colonel Musgrave found............