What worked for us (not brilliantly, but it gets us there):
1) We read the book together, difficult child 3 chooses whether he will read the narrative and I do the dialogue, or the other way around. The best way to start this with your difficult child is for you to do the dialogue, but act it out. Go over the top. Make it fun, get into the characters, do voices. Then when it's difficult child's turn to read the dialogue, he has a good example to follow. It does really help with comprehension too. Think how incomprehensible Shakespeare seemed the first time you read the words on the page. But when you saw it acted, or heard it read aloud by someone really skilled, it began to make sense? Reading aloud and acting it well makes a big improvement in comprehension.
2) Read plays together. As above, act it out well. Kids tend to absorb a certain level of self-consciousness when it comes to reading with expression; peers don't allow it, it's dorky. But in the privacy of home, you can let your hair down. I remember being in Grade 3 and the teacher said to us, "I will give a prize to the student who reads best," and I wanted that prize. So I made a conscious choice - I was going to throw all my expressive capability into the reading, in spite of my classmates being embarrassed about public displays of expression. I got the prize. It meant more to me than the embarrassed glances.
3) Get the book in DVD form (with subtitles if possible). Use subtitles on TV and DVD. It helps comprehension in a highly visual kid.
4) Get the book in audio form and get difficult child to listen to it while having the book on his lap.
Try a combination of all these. They help. But if the book MUST be read, enforce it. Make him listen at least, to you reading it. Point out that silent reading is faster, but always make sure you read all the books too, so you can discuss the books afterwards.
If you have choice in what books to read, go to the library and get hold of "Babysitters Club" and Babysitters Little SIster" books. In fact, get the Little Sister books first. READ THEM YOURSELF. Then get difficult child to read them to easy child. I know they can be a bit girly, but Little Sister ones are less so. Or there might be other good books to read. But the Babysitters ones have some subtle social lessons in them that you can identify, then draw the kids out to discuss with you afterwards. What was Karen's problem? Why did she do what she did? What trouble did it cause? How do you think the others felt? How do yo think Karen was feeling? How did it get resolve? Would you have done it this way, or would you have done things differently?
If you can find good boy books, do the same thing. An Aussie author I recommend is Paul Jennings. He writes short stories mostly, and there was a TV series made from his books. His topics are typically somewhat gross grotty boy topics, but also the social "what if?" type of poser. Interestingly, Paul Jennings is (I believe) ADHD and I wouldn't be surprised to find some mild Asperger's there. He's a former elementary teacher now a full-time author. The TV series was called "Round The Twist" and would be great for girls or boys from elementary to Middle School. Book titles (the short story collections) are titles like "Unreal!", "Uncanny!", "Unmentionable!", "Undone!", "Unbearable!", "Quirky Tales" and others. They have an Australian flavour but would have an appeal to boys everywhere. Especially boys who find school or family a struggle at times. It deals with bullies and bullying as well as just plain weird "what if?" imagination stuff. Lots of really embarrassing situations for the protagonist to get caught up in (such as licking a statue of a girl carved out of ice, and getting stuck to it). These stories are fun. Girls like them too. I do too.
Here is a link -
http://www.pauljennings.com.au/
Be aware, when you read these you might initially think, "How unsuitable!" but these get recommended reading lists in Aussie schools. Any problems you have will be purely due to cultural differences (certain words commonly used here might be offensive to you and vice versa). If you find this, let me know and I will help sort out an explanation of the cultural differences for difficult child, if you think that will be needed. But it's possible any copies for the US may have been already carefully screened. He's good at making sure his work is suitable.
There are other Aussie authors (Morris Gleitzman, for example) but for problem readers, Jennings is perhaps the best.
http://www.pauljennings.com.au/
Read his website, his blogs etc and you will understand why I think this author is perhaps one of the best choices for you to read with your son. He's SpEd-trained as well as being a highly trained and qualified teacher. Until I read his bio, I hadn't realised he was also a qualified Speech Pathologist. He's more than just a writer, he actually works to support kids who need help socially, academically or with learning difficulties. His books reflect this, but subtly. The protagonist in his books is generally the put-upon kid, the one who has to lurk behind the shed to avoid the bully. And the bully never wins in the end!
Marg