I received this book via Goodreads' Don't Buy My Love program in exchange for an honest review. 
 4.5 Stars. This is SciFi M/M romance set in our world with a new technology, mnemography. Mneming is the process of having a virtual reality experience, only a bit better. 
 Daniel Schneider, and his dad, Big Dan, own Adventureworks, a small mnemography studio in Madison WI. Daniel runs the show now, after Big Dan suffered a persistent mnem (replaced memory) testing out a program that Daniel had authored. Now, Big Dan can't remember that he's been divorced for five years and Daniel lives in shame over what happened to his dad. His confidence in mnem-coding is shattered and his business is failing. He works a second job for a competitor mnem studio to make ends meet, where he is friends with Larry. 
 Daniel is gay, and while guiding a client's mnem, he meets another man in the mnem. This has never happened before--the guides (called sherpas) aren't really a part of the program, they exist outside of it, but there is no doubt that the tall, pale man who recurs in another client's mnem is real. 
 Okay, there's some doubt. Daniel is constantly convinced he's hallucinating, or worse--mneming--his stranger into existence. Larry is able to convince Daniel that the mysterious Elijah is real however. And they track down Elijah--to find he's straight and autistic, but brilliant at mnem. His invention allows him to slip into running mnem programs as far as 100 miles away. While this is stunning to Daniel, he's even more fascinated by Elijah. Daniel has never been one to fall for a straight guy, but there's something curious about Elijah--and it seems likely that Elijah hasn't had much experience with sex, at all, not just with male partners. They struggle to connect, on account of Elijah's autism, but the manage to work it out...a bit. 
 I must say, I was thrilled by the world-building and character-development here. The world is much like ours, so it was easy to visualize, but the tech aspect was well-done. I really had the sense of the mnem a--to me they seem like VR. Big Dan was such a touching, tragic figure, perpetually defending his (estranged and ex-) wife's absence, and urging Daniel to mend fences--only to be continually confronted with copies of his divorce papers. Tired, defeated Daniel struggling to keep his business running while scared he'll mess up even more, facing his delusional father everyday and knowing his program upset the balance, he makes such a compelling character. Elijah and Larry are two scene stealers. Loved them. My only complaint is: more. I wanted MORE pages. I loved where this was going and didn't want it to end. 
 As for the heat, there really isn't much, but what there is is deeply emotionally satisfying, IMHO. I want them to get together, for real. For keeps. They seem like a match intellectually, as well as physically. 
 Will definitely be looking into the sequel.