Occasion – The Sorcerer's Spell, Nina Bruhns

As she scans the desert where her sister Gillian mysteriously disappeared every evening, Gemma sees a tall, proud horseman appear before her. He gives her a penetrating look, hands her a letter, and then gallops away. Still troubled by the extreme sensuality of the look she exchanged with the stranger, Gemma discovers with astonishment that the message—as brief as it is enigmatic—is signed by her sister… Immediately, her decision is made: she will join Gillian.

But, to do so, she must first find the mysterious horseman. A prospect that, far from frightening her, fills her with a strange exhilaration. As if the man, with a single glance, had forged a magical bond between them. A spell powerful enough to lead her straight to him…