Bisme and her family arrived at Michael Clarke's house in search of Tom Clarke, claiming to have found the Source of all Magic. Bisme used her psychic powers to establish that the Source was a diamond. After participating in a ritual to obtain the Source from Peru, the Wizards gained possession of the Source...or so they thought.
Varg had taken the real Source and left a bomb-implanted diamond in its place. It was revealed he has taken control of Bisme and her family using the Voolox. After the bomb exploded and the Nekross launched an assault on Tom's household, Bisme and her family, now free of Voolox control, were taken aboard the Zarantulus as prisoners, probably to have their magic extracted, along with Tom. After drinking raw magic, Tom is able to return Bisme, her sister and father back to their home.