Outside Of Reason (Isla Rivers #5)

Outside Of Reason (Isla Rivers #5) by Blake Pierce is out now, published December 5, 2025.

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Outside Of Reason (Isla Rivers #5)

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Outside Of Reason (Isla Rivers #5) Release Date: December 5, 2025

Published

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

Victims emerge from beneath the frozen surface of Lake Superior, their deaths masked as accidents until FBI Agent Isla Rivers detects sinister signs of foul play. As Isla delves into the frigid heart of a winter-bound city, she must piece together the chilling puzzle before the lake claims another soul.

OUTSIDE OF REASON is the fifth 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!

“An edge of your seat thriller in a new series that keeps you turning pages! …So many twists, turns and red herrings… I can’t wait to see what happens next.”
—Reader review (Her Last Wish)
⭐⭐⭐⭐⭐

“A strong, complex story about two FBI agents trying to stop a serial killer. If you want an author to capture your attention and have you guessing, yet trying to put the pieces together, Pierce is your author!”
—Reader review (Her Last Wish)
⭐⭐⭐⭐⭐

“A typical Blake Pierce twisting, turning, roller coaster ride suspense thriller. Will have you turning the pages to the last sentence of the last chapter!!!”
—Reader review (City of Prey)
⭐⭐⭐⭐⭐

“Right from the start we have an unusual protagonist that I haven’t seen done in this genre before. The action is nonstop… A very atmospheric novel that will keep you turning pages well into the wee hours.”
—Reader review (City of Prey)
⭐⭐⭐⭐⭐

“Everything that I look for in a book… a great plot, interesting characters, and grabs your interest right away. The book moves along at a breakneck pace and stays that way until the end. Now on go I to book two!”
—Reader review (Girl, Alone)
⭐⭐⭐⭐⭐

“Exciting, heart pounding, edge of your seat book… a must read for mystery and suspense readers!”
—Reader review (Girl, Alone)
⭐⭐⭐⭐⭐

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Genre: Thriller

Blake Pierce

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