LOVE'S NATURAL LAWBiologist Libby Stapleton was ready for anything when she met her unwilling partner on a government environmental study-anything, that is, except forest manager Dan Wagner, whose animal grace and disturbing honesty filled her with swift, passionate longing.Suddenly the dreaded three-week trek into wild mountainous terrain became a dangerous adventure into an uncharted world of desire.But Dan was a man who played the game of life by his own rugged rules. If Libby wanted to win his heart, she had to live by the laws of nature-and survive.