Blindsight

the long version

"[This book] is the story of a good though damaged man and his less than virtuous sister. As their childhood closeness unravels, Alice moves into her career in science (she's a mycologist), while Gordon descends into vagrancy and silence. For more than thirty years they do not meet. Then a young man appears at Alice's door, claiming a relationship she never knew she had. As he becomes part of her carefully guarded world, she cautiously begins to reveal the past. But is she telling him everything? Jealousy, ambition and love shape the fates of Alice and Gordon in this story of loyalty and family ties. ..."--Back cover.