Outside The Dark (Isla Rivers #13)

Outside The Dark (Isla Rivers #13) by Blake Pierce is out now (published September 23, 2026).

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Outside The Dark (Isla Rivers #13)

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Outside The Dark (Isla Rivers #13) Release Date: September 23, 2026

Published

“A masterpiece of thriller and mystery.”
—Books and Movie Reviews, Roberto Mattos (re Once Gone)
⭐⭐⭐⭐⭐

When bodies turn up inside Duluth’s decaying ironworks, posed like offerings to the rust and steel, FBI Agent Isla Rivers knows she’s hunting something far darker than a killer — she’s hunting an obsession. In a city built on iron and ambition, someone believes they have the power to remake the dead — and Isla must stop them before the forge claims its next victim.

OUTSIDE THE DARK is the thirteenth book in a long-anticipated new series by #1 bestseller and USA Today bestselling author Blake Pierce, whose bestseller Once Gone (a free download) has received over 7,000 five star ratings and reviews. The series begins with OUTSIDE THE ROOM (book #1).

The Isla Rivers series is a riveting mystery series brimming with suspenseful cat-and-mouse dynamics and unexpected turns that will send shivers down your spine. Its enthralling female lead will capture your affections and keep you engrossed in the pages long after you turn out the lights. Fans of Lisa Regan, Lee Child, and Mary Burton are sure to fall in love.

Future books in the series are also available!

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Genre: Thriller

Blake Pierce

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