The Raven Boys has been announced as a four-book series.

Aliens Stole My Body concludes the four-book series.

She is also currently writing a four-book series loosely based on her childhood.

The existence and nature of Teela's luck is debated back and forth by the characters throughout the four-book series.

It is the first volume in a planned four-book series, as confirmed in an interview with Brent Weeks, called The Lightbringer Series.

Her four-book series entitled Living in History took a comprehensive approach to particular eras rather than looking at one aspect throughout the ages.

Brooks then wrote a four-book series titled The Heritage of Shannara.

She is currently working on her newest Zebra historical romance, the first of a new four-book series set during the Regency period (to be published in June 2002).

Here the parallel scenes bring some feeling of closure to a novel that isn't actually over, since it's the first in a four-book series.

Twelve of the novels constitute volumes in four-book series, all written in the tradition of the Horatio Alger stories-hard work and honesty will lead to success.