There are 2 books in the Dreamworld Duology series. The newest book is A Dream Within a Dream which came out in 2019.

1
All That We See Or Seem

Book cover of All That We See Or Seem
Every night, seventeen-year-old Reeve Lennox finds herself under a noose.

By day she is a lady of Acarsaid’s royal house, daydreaming of adventure and love. But every night in sleep she wanders through a nightmarish city, an invisible witness to the screeches of monsters and the screams of their victims.…
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2
A Dream Within a Dream

Book cover of A Dream Within a Dream

Invisible to the man she loves, Reeve Lennox fights to reclaim him from a dark world.

As her wedding day nears in Acarsaid, her betrothed Arden offers only his wayward soul and saucy tongue. At night she desperately tries to reach Bran, the young soldier of nightmarish Tenebris who holds…