In Aaron Ryan's The Darkness Within, horror novelist Tanner Barrett once built his career on bestselling thrillers, but falling sales leave him afraid his readers are gone. When his friend Austin gives him Syntax, an untraceable serum said to repair the body and sharpen language, Tanner sees a way back. His sister Tara Gayle warns him that no one knows where the substance came from, but Tanner takes it as he races to finish The Darkness Within, the book he believes can restore his name. At first, the serum erases his pain and speeds up his writing. Then the blackouts begin. As a hostile reviewer enters Tanner’s thoughts and a police inquiry reaches his door, Tara must face what Syntax may be turning her brother into before his comeback becomes something worse.

If ambition had a chemical taste, The Darkness Within by Aaron Ryan would pour it straight down your throat. I loved the way the book builds Tanner Barrett’s horror from the inside out, beginning with a fading author’s need to matter before Syntax turns that need into something far less human. The build-up works because each small choice is defensible at first. That makes the ultimate spiral nastier when success begins looking like contamination instead of reward. Tanner has the raw, twitchy vibe of someone who wants love but keeps reaching for applause. Tara gives the story a grounded sisterly alarm, so the horror stays painfully close to home even as it mutates. I would recommend this to readers who like body horror rooted in creative obsession, especially when dread crawls under the skin before anyone realizes the door is locked. Very highly recommended.

The Darkness Within is a psychological thriller by Aaron Ryan. Tanner Barrett used to write bestsellers. But it's been a while since any of his novels were praised by critics or the general public. Desperate to recover his lost glory and silence his most vocal naysayers, Tanner resorts to drinking a strange serum he received from his friend to boost his creativity. Soon, he finishes writing the bestseller he always wanted. However, he is plagued by constant nightmares and blackouts that he can't explain. He also starts showing withdrawal symptoms from the serum. While his sister, Tara, is worried by his behavior, people with links to Tanner end up being mysteriously killed. He flees to Morocco and becomes increasingly unhinged. With the authorities searching for him, will Tanner find his way back?

The Darkness Within is a pulse-pounding thriller with a healthy dose of suspense and horror. What struck me instantly was Aaron Ryan's unconventional approach to the narrative. The entire story is told through journal entries of the main character, Tanner, and his sister, Tara. This made the tale very intimate and immersive for me. Ryan's ability to put you in the character's headspace is truly commendable. Tanner is unhinged but fascinating to read about. He starts the story trying to prove his worth as an author, and by the end, becomes someone you could never have foreseen. The slow deterioration of his mind is perfectly captured in an absorbing narrative that keeps its hooks in you until the end. If you're a fan of psychological thrillers and horror, do not miss out on this book!