The Power of Five (also known as
The Gatekeepers in the US) is a series of five
fantasy and suspense novels, written by English author
Anthony Horowitz and published between 2005 and 2012. It is an updated re-imagining of Horowitz's
Pentagram series, which the author had left unfinished in the 1980s. The series is published in the United Kingdom by Walker Books Ltd and in the United States by
Scholastic Press. The novels deal heavily in the
occult and examples of things such as
human sacrifice and
blood rituals are major plot elements, such as in the first book, where the protagonist,
Matthew Freeman, is hunted by a Cult who want to conduct a blood sacrifice on him to blast open a portal using a combination of nuclear physics and black magic, to unlock another dimension which is holding a group of ancient evil demons captive.