http://www.rifters.com/real/Blindsight.htm

My capsule summary:

In the 2070s, on the cusp of the singularity, a swarm of alien drones takes a snapshot of the Earth before burning up in the atmosphere. A small crew of bleeding-edge posthumans, all with different physical or mental augmentations, is sent to the outer Solar System to investigate the source. The narrator, Siri Keeton, is an emotionally lobotomized "synthesist" tasked with monitoring the mission and interpreting it for the leadership back home.

I don't want to spoil its frightening twists, but suffice to say that it shapes up to be a cosmic horror novel where the horror is rooted in abstract ideas like human cognition and the nature of consciousness. The book is peppered with philosophical concepts like the Chinese Room and (real-life) neurological quirks like blindsight, all bent towards smart, existential horror. Like Lovecraft mixed with Oliver Sacks.

And while the ideas are solid -- the author is a marine biologist who fills the appendix with citations of evolutionary and cognitive research -- what I really love is the prose. Watts is a fantastic hard SF writer, filling every page with authentic, charismatic narration, cinematic imagery, and a way of talking about abstruse scientific concepts in a way that punches you in the gut and chills you to the bone. His style is like a horror version of Douglas Adams, mind-bending ideas and memorable characters with a compulsively readable flow to it.

Its biggest weakness is that one of the most compelling aspects sounds like a pulpy joke at first glance -- the ship is led by a "vampire." I can't imagine how many people read this on the jacket and took a hard pass on Dracula in Space. But it's not some fantasy gimmick -- it's the in-universe nickname for an ancient, predatory, sociopathically brilliant subspecies of humanity that's been resurrected, Jurassic Park-style, to help manage high-stakes ventures like the first-contact mission. The captain starts off intriguing, quickly grows frightening, and eventually advances one of the book's most disturbing and unforgettable arguments.

Overall, it's not just my favorite SF novel, but one of my favorite novels, period. The only book I've ever bought a dead-tree copy to be signed by the author. Highly, highly recommended.

Probably a bit too heavy on ideas for most and those who are only used to lighter cost might find it boring. But for me one my all time favorite sci-fi books.