MEXICAN HEAT... For Annie McCallister, divorce was just another item for herlist of failures. But here in Puerto Madero, she'd found a haven...goodfriends...time to forget...and the children. Her little refugees. She'dhandled their tears, fears, spats and hurts with remarkable aplomb. Sheloved them - and they loved her. Then she met the dark, passionate LuisCalderone and felt a yearning excitement she'd never known. She wove a spellaround him that he both relished and resented. Anna - his beloved gringa - astrange, funny woman who'd come into his well-ordered life trailing aconfusion of children behind her - and making him smile.