Return to Marblehead.   One finger holds your place between chapters as you tune in to the frequency of seagulls and sandpipers and sunrise. One sailboat glides across an emerald plate of water in the bay, and cheerful voices float over salt-weathered fences, tangles of beach roses. Stretch, inhale. Perfume of roses, salt air. A sip of tea. Chapter Four.   Marblehead Floral Linen Trousers (No. J8232). Exquisite linen and tencel blend wide-leg trouser with a spirited allover floral print. Easy-to-wear drawstring waist with elastic waistband. Patch pockets at front. Single welt pockets at back. Imported.