Secret Vampire
Daughters of Darkness
Enchantress (spellbound US)
Dark Angel
The Chosen
Soulmate
Huntress
Black Dawn
Witchlight
Strange Fate (not yet released)
There are three books in the night world series
The Night World series was written by L.J.Smith.
The Fourth Apprentice, Fading Echoes, and Night Whispers.
The author Lisa Smith has written several series of books. Her books include The Night World Series, The Vampire Diaries and Series, The Secret Circle Series, and The Forbidden Game Series.
As of now, the Night World series by LJ Smith consists of nine books. There is no fourth book known to exist in the series.
The books in the Warriors: Omen of the Stars series are The Fourth Apprentice, Fading Echoes, Night Whispers, Sign of the Moon, The Forgotten Warrior, and The Last Hope.
The series is called The Immortals. The books in the series, in order, are as follows: Evermore, Blue Moon, Shadowland, Dark Flame, Night Star and Everlasting.
The Night World Series was written by Lisa Jane Smith. Her pen name being L. J. Smith. She has also written the series called Vampire Diaries among others.
8 books exist in this intense series. (That i know of so far.) They are as follows: Marked Betrayed Chosen Untamed Hunted Tempted Burned Awakened (out on January 4 2011.)
An older but awesome series that has several books Night World by L.J. Smith. You can check out the books here: http://www.vampirelibrary.com/books/ljsmithn.htm.
If you mean the Series, Omen of the Stars, So far there is The Fourth Apprentice, Fading Echoes and Night Whispers.
There's ten-Secret VampireDaughters of DarknessSpellbinderDark AngelThe ChosenSoulmateHuntressBlack DawnWitchlightStrange Fate:D