There are 7 books in the The Mediator series. The newest book is Remembrance which came out in 2016.

1
Shadowland

Book cover of Shadowland

Shadowland is the first book in the thrilling, romantic Mediator series, from the New York Times bestselling author of the Princess Diaries, Meg Cabot. 

Suze is a mediator—a liaison between the living and the dead. In other words, she sees dead people. And they won't leave her alone until she…

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2
Ninth Key

Book cover of Ninth Key
FOR USE IN SCHOOLS AND LIBRARIES ONLY. Sixteen-year-old Suze Simon can mediate between the living and the dead, and she is in love with a ghost from the 19th-century, but she is also troubled by the ghost of a murdered woman.

3
Reunion

Book cover of Reunion

Reunion is the third book in the thrilling, romantic Mediator series, from the New York Times bestselling author of the Princess Diaries, Meg Cabot. 

The RLS Angels are out for blood, and only Suze can stop them—since she's the only one who can see them. The four ghostly teenagers died…

4
Darkest Hour

Book cover of Darkest Hour

The Darkest Hour is the fourth book in the thrilling, romantic Mediator series, from the New York Times bestselling author of the Princess Diaries, Meg Cabot. 

When the nineteenth-century ghost of Maria de Silva wakes her up in the middle of the night, Suze knows this is no ordinary visitation—and…

5
Haunted

Book cover of Haunted

Haunted is the fifth book in the thrilling, romantic Mediator series, from the New York Times bestselling author of the Princess Diaries, Meg Cabot. 

Suze is used to trouble, but this time she's in deep: Ghostly Jesse has her heart, but Paul Slater, a real flesh-and-blood guy, is warm for…

6
Twilight

Book cover of Twilight

Suze has gotten used to ghosts. They wake her up in the middle of the night. They haunt her locker at school. She's even spotted a few down at Carmel Beach. Suze is a mediator, after all, and communicating with the dead is all in a day's work for her.…

7
Remembrance

Book cover of Remembrance
Fifteen years after the release of the first Mediator novel, #1 New York Times bestselling author Meg Cabot returns with a deliciously sexy new entry to a fan-favorite series. Suze Simon-all grown up and engaged to her once-ghostly soulmate-faces a vengeful spirit and an old enemy bent on ending Suze's…