There are 3 books in the Winterhouse series. The newest book is The Winterhouse Mysteries which came out in 2019.

1
Winterhouse

By Ben Guterson , Chloe Bristol (illustrator) ,

Book cover of Winterhouse

An Edgar Award Finalist
An Agatha Award Finalist

An enchanting urban fantasy middle-grade debut―the first book in a trilogy―set in a magical hotel full of secrets.

Orphan Elizabeth Somers’s malevolent aunt and uncle ship her off to the ominous Winterhouse Hotel, owned by the peculiar Norbridge Falls. Upon arrival, Elizabeth…

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2
The Secrets of Winterhouse

By Ben Guterson , Chloe Bristol (illustrator) ,

Book cover of The Secrets of Winterhouse
Back at the Winterhouse hotel for another holiday season, Elizabeth and Freddy dig deeper into the mystery surrounding Riley S. Granger, a hotel guest who left behind odd artifacts - one being a magical book that the evil Gracella Winters attempted to use the year before to gain destructive power…

3
The Winterhouse Mysteries

By Ben Guterson , Chloe Bristol (illustrator) ,

Book cover of The Winterhouse Mysteries
It's springtime at Winterhouse and Elizabeth is settling into the joyful chaos of her new home. But it isn't long before she and Freddy are drawn into an ominous new mystery. Guests at the hotel start behaving oddly, and Elizabeth's powers manifest in thrilling - sometimes frightening - new ways.…