If you were fascinated by the psychological tension and mystery surrounding Kelvin's attempts to communicate with the sentient ocean in Solaris, you'll be riveted by Blindsight. Peter Watts crafts an eerie first-contact scenario where a crew of flawed specialists confronts an utterly incomprehensible alien presence on the edge of the solar system. The novel's scientific rigor and relentless exploration of consciousness and intelligence will grip you from start to finish.

If the baffling attempts to understand and communicate with Solaris's ocean drew you in, you'll love Embassytown. China Miéville weaves a mesmerizing tale where language itself is both weapon and wonder, as human colonists struggle to comprehend the Hosts—aliens whose thought and speech are inseparable. The novel's focus on linguistic barriers and the limits of understanding make it a thought-provoking companion to Solaris.

If you appreciated Kris Kelvin's internal struggles and the disorienting atmosphere aboard the Solaris Station, Annihilation will captivate you. Jeff VanderMeer's novel delves into the minds of an expedition team exploring the mysterious Area X, where reality and perception blur. The narrative's focus on psychological depth and the haunting unknown echoes the existential unease found in Solaris.

If the alien ocean's inscrutability in Solaris left you pondering the limits of human understanding, Roadside Picnic will resonate deeply. The story follows 'stalker' Redrick Schuhart as he navigates the dangerous Zone, an area transformed by an inexplicable extraterrestrial visitation. Like Lem's classic, this novel refuses to provide easy answers, challenging readers to confront the mysteries that defy explanation.

If you were moved by the intimate, melancholic tone of Kelvin's journey and the emotional resonance of confronting the unknown in Solaris, you'll find Never Let Me Go affecting and profound. Ishiguro's novel follows three friends at a secluded English boarding school as they slowly uncover the unsettling truth about their existence, blending science fiction with deep psychological and emotional impact.