philadelphia. cnn's susan candiotti explains why it's especially worrisome to the vatican. >> reporter: despite efforts to change the ways, philadelphia's archdiocese again is facing damning allegations from a grand jury including a child sex abuse cover-up. >> it's clear that more needs to be done. >> reporter: these two priests edward avery and charles englehard accused of raping the same boy. father james brennan accused of assaulting a different boy in 1996 but allegations against a forty priest is setting the case apart. here's what makes this case different. it appears to be the first time a priest who's not accused of being an abuser himself is charged with going out of his way to put dangerous priests into contact with more children who, in turn, also were abused.