Well first you have to get the book from the graveyard. In order to gain access into the graveyard, you need to go to the garden area and get some flowers, which requires the use of clairvoyance and the crow feather.
After you get the flowers, you have to go to the graveyard with the flowers equipped. (Raz says that he's a greiving widow. So sad!) Once inside the graveyard, head to the tomb at the far end and use pyrokinesis to burn the vines away, and get inside. Get the book inside the tomb and, after a quick cutscene, you'll appear back at Boyds house, and he gives you the rifle. With the rifle you will be able to get through the barrier and to the book depositiory.
Be sure to have sheild equipped when you get there though, or you'll get shot.