There are 3 books in the The Gateway Trilogy series. The newest book is Spirit Ascendancy which came out in 2015.

1
Spirit Legacy

Book cover of Spirit Legacy
Experience the paranormal like never before...

"The Gateway is open."

These cryptic words wake college student Jess Ballard from a terrifying dream into an even more terrifying reality. Jess’ life has never been what anyone would call easy; doing damage control in the wake of your nomadic, alcoholic mother doesn't…

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2
Spirit Prophecy

Book cover of Spirit Prophecy
Two sisters, haunted by more than their past...

Just weeks after discovering each other’s existence, Jess and Hannah Ballard arrive at Fairhaven Hall, where they will learn the clandestine ways of the Durupinen, an ancient sect of women who control the Gateways between the worlds of the living and the…

3
Spirit Ascendancy

Book cover of Spirit Ascendancy
A power too terrible to control...

In the wake of their terrifying escape from Fairhaven Hall, sisters Jess and Hannah Ballard find themselves on the run, pursued by the two most powerful groups in the history of the spirit world. On one side, the Durupinen, determined to capture the girls…