A Vow of Silence Author:Veronica Black "Outstanding." Publishers Weekly — A Sister Joan Mystery. — The sisters at lonely Cornwall Convent share chilling secrets they cannot confess . . . Sister Sophia is dead. Sister Magdalen has vanished. Sister Joan, newly transferred to the convent to investigate its mysterious troubles, begins to suspect what she hardly dares to name: Blasphemy . .... more » . and worse . . .« less