''A comfortable chair and a Mary Stewart: total heaven. I''d rather read her than most other authors.'' Harriet EvansLegend has it that when the Gabriel Hounds run howling over the crumbling palace of Dar Ibrahim, high in the Adonis Valley of Lebanon, death will follow on their heels. When rich, spoilt Christie Mansel arrives at the decaying palace to look after her eccentric Aunt Harriet, she arrives to the sound of howling dogs. The palace is riddled with hidden passages and the servants are unwilling to let anyone see Harriet during the day. It seems the palace hides an extraordinary secret . . . one that somebody is willing to kill to keep.The deep blue oblong of sky above the open court was pricking already with brilliant stars. No ugly diffusion of city light spoiled the deep velvet of that sky; even hanging as it was above the glittering and crowded richness of the Damascus oasis, it spoke of the desert and the vast empty silence beyond the last palm tree.