Dept of Unexplained Phenomenon Books in Order

by Lauren OliverMystery, Thriller & Suspense

1 book so far (book 2 is due May 11, 2027). They run from The Girl in the Lake (2026) to The Girl in the Lake (2026). Rated 4.2 across 146 listener reviews.

Next Dept of Unexplained Phenomenon book

The Sleepwalker

Book 2 · out May 11, 2027 · preorder now

Kindle Paperback Audiobook

Reading order

The Girl in the Lake

Book 1 2026 4.2 (146)

A young girl who claims to remember a past life draws a psychologist into a decades-old mystery in a haunting novel of suspense by New York Times bestselling author Lauren Oliver.

Kindle Paperback Audiobook
The Sleepwalker

Book 2 Out May 11, 2027

A boy who committed murder in his sleep draws an investigator into the nightmares of childhood in a gripping novel of suspense by the New York Times bestselling author of The Girl in the Lake.

Kindle Paperback Audiobook

About this reading order

Books are listed in the series' own numbering, which for Dept of Unexplained Phenomenon is also the best order to read them in. Years are first publication where we could confirm it, and otherwise the first audiobook release.