Golden Days — D.E. Stevenson

Mrs Tim goes to the Highlands of Scotland and is involved in a plot to rescue a naval officer from the toils of a siren; but, alas, the best laid plans "gang aft agley".
The characters are skilfully drawn, from the fierce Mrs London with her heart of gold to the garrulous Mrs Falconer whose muddled stories of her girlhood make excruciatingly funny reading.
The house party amuses itself with picnics and fishing excursions and is suitably thrilled by the flourishing ancestral feud of two rival clans, which has its origin in the dim past.