They're The Old Kingdom Trilogy by Garth Nix. The whole series is about necromancy and are all around awesome. I'd heartily recommend them to anyone. Wikipedia can explain it better than I, so here's the summary of the first book, Sabriel, taken from there:
The novel is set in two neighbouring fictional countries: To the south lies Ancelstierre, which has a technology level and society similar to that of early-20th century England, and to the north lies the Old Kingdom, where magic works and dangerous spirits roam the land — a fact officially denied by the government of Ancelstierre and disbelieved by most of Ancelstierre's inhabitants. (Those who live near the border know the truth of it, especially on days when the wind is blowing out of the Old Kingdom.) These dangerous spirits range from undead corpses known as Dead Hands to supernatural beings known as Free Magic elementals.
These living Dead are raised by Necromancers, or black magicians, who roam the Old Kingdom or live in Death, using Hands to do their bidding. To remedy the problem of dangerous, living dead, there is always a sorcerer with the title of Abhorsen, who is essentially a Necromancer himself (or herself), only in the reverse; he puts the dead to rest. At the time of Sabriel, it is her father, Terciel, who has the job of controling the endless dead creatures doing evil deeds around the Wall, especially difficult since a new evil seems to be rising.
When the current Abhorsen is overcome by one such evil, he sends his bells and sword to his daughter Sabriel, who is being raised in an Ancelstierre school, out of reach of those who might try to strike at her father through her. She must return to the Old Kingdom to rescue her father and prevent the evil's return.
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The novel is set in two neighbouring fictional countries: To the south lies Ancelstierre, which has a technology level and society similar to that of early-20th century England, and to the north lies the Old Kingdom, where magic works and dangerous spirits roam the land — a fact officially denied by the government of Ancelstierre and disbelieved by most of Ancelstierre's inhabitants. (Those who live near the border know the truth of it, especially on days when the wind is blowing out of the Old Kingdom.) These dangerous spirits range from undead corpses known as Dead Hands to supernatural beings known as Free Magic elementals.
These living Dead are raised by Necromancers, or black magicians, who roam the Old Kingdom or live in Death, using Hands to do their bidding. To remedy the problem of dangerous, living dead, there is always a sorcerer with the title of Abhorsen, who is essentially a Necromancer himself (or herself), only in the reverse; he puts the dead to rest. At the time of Sabriel, it is her father, Terciel, who has the job of controling the endless dead creatures doing evil deeds around the Wall, especially difficult since a new evil seems to be rising.
When the current Abhorsen is overcome by one such evil, he sends his bells and sword to his daughter Sabriel, who is being raised in an Ancelstierre school, out of reach of those who might try to strike at her father through her. She must return to the Old Kingdom to rescue her father and prevent the evil's return.