If the opening warehouse takedown and freeway pursuits in Zero Sum Game had you flipping pages, Recursion delivers that same pedal-to-the-floor momentum. As memory-tech spirals out of control, Barry Sutton and Helena Smith race through collapsing timelines with the same relentless urgency Cas brings when she’s calculating bullet trajectories on the fly. It’s a smart, high-adrenaline thriller that hits the gas and never lets up.

Loved Cas’s do-what-it-takes ethos and her uneasy alliance with the remorseless Rio? Meet Mars Xi, a telekinetic weapon who slices starfighters apart and wrestles with the fallout. Like when Cas dismantles Harmony’s syndicate and draws her own moral lines, Mars takes brutal action against those hunting her, then has to live with the choices. The result is lean, propulsive, and gloriously sharp-edged.

If Cas’s vector-calc 'superpower' and the Harmony cult’s brain-hacking grabbed you, Nexus runs straight at that intersection of ability and neuroscience. Kade Lane’s illegal neural software lets minds link—and be manipulated—sparking black-ops chases and ethical knife-fights much like Cas’s battles with telepaths and conspiracies. Think Cas analyzing a gunfight in milliseconds, but scaled up to networks of minds and the geopolitics that follow.

If following Cas as she dismantles Harmony and protects people like Arthur and Pilar hooked you, you’ll click with Hwa—a bodyguard on a massive oil-rig city who’s dragged into protecting an heir amid murders and corporate secrets. Like Cas, Hwa fights with skill, grit, and zero quit, threading through power plays and danger while uncovering a deadly conspiracy.

If the late-book shocks about Cas’s tampered memories made your jaw drop, Altered Carbon delivers that same noir tangle of deception and identity. As Takeshi Kovacs digs into Laurens Bancroft’s so-called suicide, stacked reveals hit like Cas discovering who’s been messing with her mind. It’s gritty, violent, and twisty—perfect if you liked Cas’s brutal calculations and the way every answer opened a darker question.