I am searching for a novel I read in the 1980s about a researcher looking into numerous SIDS deaths in several generations of one family. It turns out that the family heirloom cradle was made from the wood from the cross on which Jesus was crucified. There was a curse on the wood and over centuries everything made from this wood was cursed and caused death. I think it had a dark blue or black cover and was in the style of a John Saul thriller. Please help- this has been driving me CRAZY!!!