The Nightwalker by Sebastian Fitzek (Pegasus Crime)

Leon Nader thought he'd left his violent sleepwalking days behind. For years, he managed to live a normal life until his wife disappeared from their apartment without a trace. Suddenly, he’s left wondering if his old “nocturnal twin” has come back. Desperate for answers, he straps a camera to his head to record his sleep. Watching the footage, he sees himself vanish into a hidden passageway behind a wall he never noticed before. 

It’s a brilliant setup, playing on that deep, universal fear: What really happens when we’re asleep? Do we even know who we are in the dark?

The story works because Leon is a mess, honestly, he’s all over the place, but he’s the kind of mess you can relate to. He’s fighting against his own biology, wrestling with a subconscious that seems to have its own plans. The tension feels real, especially for anyone who’s ever felt at odds with their own mind or body. The other characters don’t get much depth; they’re mostly there to reflect Leon’s paranoia back at him. But honestly, in a tight, claustrophobic thriller like this, that narrow focus ramps up the anxiety and keeps the spotlight firmly on Leon’s unraveling mind.

Fitzek doesn’t bother with high-concept gimmicks. Instead, he dives straight into the mechanics of the subconscious. In a world obsessed with self-improvement and mindfulness, the story lands like a punch: there are corners of our brains we just can’t reach, places that stay hidden, and sometimes, those places are dangerous. The book taps into a very modern anxiety, the feeling that our secrets aren’t safe, that a single recording could reveal things about ourselves we’d rather not know.

The prose is lean, fast, stripped of any unnecessary atmosphere. Fitzek skips the flowery descriptions you get in a lot of psychological thrillers and lets the bizarre situation speak for itself. The pace rarely lets up. Sometimes, the logic starts to wobble, as if the plot’s sprinting just ahead of the reader’s questions. The relentless speed and the way it explores the dream world feel rooted in real psychological fear, not just cheap thrills.

If you like fiction that makes you question your own habits, pick this up. We all want to believe we’re in control, but Fitzek argues otherwise: Maybe we’re just along for the ride, and our bodies have their own secret lives once we drift off. It’s a sharp, unsettling look at the parts of ourselves we never get to see.

4/5