The Switchers Trilogy is a fantasy book series for young adults, written by British-Irish author Kate Thompson.

Toward the end of the first book, Lizzie reveals that all children are born with the ability to Switch, but that unless they discover it before they turn eight (the age at which their minds begin to conform to the ideas presented by others) it remains dormant within them and never surfaces again.

In Wild Blood, the final book of the series, the Switching power is revealed to originate from interbreeding between humans and members of the Tuatha Dé Danann, who were well known for their shapeshifting abilities.

This book also reveals that Switchers can choose to become like their fairy ancestors, and so retain their gift beyond their fifteenth birthday, but such a transformation permanently cuts them off from the human world.

Before she knows what is happening, Tess finds herself leaving behind her comfortable home and her parents to journey with Kevin to the Arctic circle, where they must face the fearsome and ancient krools.

While at her cousins' house, Tess discovers that there is something strange and frightening lurking in the nearby woods, beckoning her to join it in its otherworldly domain.

Another theme that could be read between the lines, but is stated at the end of the third book, is that the world is in danger and the new generation needs to protect the planet.