Depending on your idiosyncrasies, this could be a four or a two. It has the hallmarks of the flawed novel that becomes a cult classic. It mixes neat ideas, farcical conceits, and good characterization. Except for the primary plot driver, which is a surprisingly forgivable "except," it is a great book.
Eric Sanderson has a dissociative disorder that has gradually been erasing his memory. Today, he woke with nothing, but letters from himself start explaining how to protect himself from conceptual sharks that feed on memories.
That would be the plot driver that throws me: conceptual sharks in the stream of consciousness. More completely, the book treats concepts as if they were "out there," not just bits in your head. If you take Platonic realism seriously, I have trouble taking you seriously. But hey, it's a book, we'll throw that overboard, as it were. Let's play as if concepts were ontological entities rather than epistemological ones, why not?
The why not comes in the name of Mycroft Ward, a sort of equal and opposite to the conceptual shark. Although the description of how he got going smacks a bit of Jules Verne's science fiction, the result is actually within the bounds of near-future technology. Let's call him a memetic lich or a potential singleton. If you did not understand that, great, no spoiler; if you did, you probably understand how those concepts might not work with Platonic realism. We have an interesting and more believable potential antagonist, introduced and mostly set aside in favor of the sillier one.
But hey, everyone likes sharks, right? Also, if the idea of neuro-linguistic hacking from Snow Crash fascinated you, here is another trip on a parallel path. The light bulb text encryption, and the bonus revelation late in the book, might appeal of Cryptonomicon fans, but I have yet to read that one.
The book has excellent structure. Let's discuss it in line with its four parts.
In the first part, we meet Eric Sanderson and get an idea of his situation. This feels like a dull version of Memento (good movie, see it sometime). For the first half, I was looking forward to that 20% point where I sometimes jump ship, so to speak, although the interaction between Eric and Clio is fun. Chapter six is where the conceptual story comes to the foreground, after a great foreshadowing page in chapter three. I decided to give the wacky idea a chance, as does Eric.
In the second part, Eric sets out to find himself. As he is an amnesiac, this is in a more literal sense than usual. If you're not sure whether this is worth reading, get to (or skip to) chapters fourteen and fifteen. They sold me. They add action to the book and start giving real weight to the implications of a world where free-floating concepts can affect us. I have my fridge logic complaints about why Mr. Nobody has the worst schedule timing ever, when he provably knew better, but it is a great bit. Heck, worth reading even if you think the whole thing sounds like rubbish.
In the third part, Scout guides Eric on the path he needs. This is the best part of the book, on the strength of characterization and character interaction. I am fond of Scout; she clicks with Eric better than Clio did, and I liked the Eric/Clio almost-flashback chapters. This part takes us deeper into the rabbit hole, as the conceptual realism becomes the surroundings, again in a literal sense. Part three includes the story of Mycroft Ward and some great scenes of people hurting each other because they don't know how else to deal with their own pain. Not that I am all about suffering, but this is really well done pain, heart-wrenching in its simple effectiveness, although I say that having become a huge sap some years ago.
The fourth part goes completely overboard with the conceptual realism, once again literally. That's cryptic enough to be non-spoiling, yes? Reality falls into the background as realism takes over. I will spare the details, since this is the ending, and you are going to finish if you have read this far. Let me give you two notes. First, this section is shorter than it looks, due to a fifty-page flipbook of ASCII art. You heard me. Second, if you are hunting a conceptual shark from the concept of a shark-hunting boat, made rock solid because most of the world has had the same mental image of a shark-hunting boat for decades, you might remember that shared mental image comes from Jaws.
You can decide how you feel about the ending. Remember, our potentially unreliable narrator identifies himself as potentially insane from the very beginning.
Amazon link