There are 3 books in the Detective Elin Warner series. The newest book is The Wilds which came out in 2024.

1
The Sanatorium

Book cover of The Sanatorium
REESE'S BOOK CLUB PICK | A New York Times bestseller!

"An eerie, atmospheric novel that had me completely on the edge of my seat." -Reese Witherspoon

"This spine-tingling, atmospheric thriller has it all... and twists you'll never see coming." -Richard Osman, New York Times bestselling author of The Thursday Murder…
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2
The Retreat

Book cover of The Retreat

Will you brave The Retreat? The new bestselling thriller from the author of The Sanatorium.

They couldn't wait to stay here.
An idyllic wellness retreat has opened on an island off the coast of Devon, promising rest and relaxation - but the island itself, known locally as Reaper's Rock, has…

3
The Wilds

Book cover of The Wilds

The Sanatorium took you to the Alps and chilled you to the bone. Now, The Wilds will take you deep into the woods . . . and out there, it's easy to get lost.
'The most addictive book I've read in a long time . . . This book really…