Janet and 'Twice' Alexander break new ground in the island of St. Jago, British West Indies-a setting as far removed from the Highlands of Scotland as a calypso from a lament.But it takes more than a planter's punch compounded of island feuds, jealousies and intrigues to put out the exuberant Alexanders-as this further sparkling episode in the now-famous saga shows, through an unexpected drama provides a startling climax.