What one might classify as ""good tripe"" -- a novel on a time worn theme, the triangle a la Lady Chatterley of the invalid husband, the devoted wife and the lover. The young couple have escaped reality and curious eyes by going to the coast of Spain. The prospective lover arrives on the scene, escaping the tragedy of his bride's sudden death. The denouement is more or less inevitable -- the claims of pity and affection and the past hold the wife to her husband, even though she is carrying her lover's child. -- The theme, uninspired as it is, has merit in the details of the handling. A very readable tale, for moments when no intellectual strain is wanted. Rentals.