“But what’s the motive?” I ask, and on cue, Theo thunders down the stairs.

“Where’s the freak?” he yells.

“Theo, you will not call your brother-”

“How about I stop calling him a freak when he stops stealing things out of my room?” I have instinctively stepped between him and his brother, although Jacob is a head taller than both of us.

“I didn’t steal anything from your room,” Jacob says.

“Oh, really? What about my sneakers?”

“They were in the mudroom,” Jacob qualifies.

“Retard,” Theo says under his breath, and I see a flash of fire in Jacob’s eyes.

“I am not retarded,” he growls, and he lunges for his brother.

I hold him off with an outstretched arm. “Jacob,” I say, “you shouldn’t take anything that belongs to Theo without asking for his permission. And Theo, I don’t want to hear that word come out of your mouth again, or I’m going to take your sneakers and throw them out with the trash. Do I make myself clear?”

“I’m outta here,” Theo mutters, and he stomps toward the mudroom. A moment later I hear the door slam.

I follow Jacob into the kitchen and watch him back into a corner. “What we got here,” Jacob mutters, his voice a sudden drawl, “is… failure to communicate.” He crouches down, hugging his knees.

When he cannot find the words for how he feels, he borrows someone else’s. These come from Cool Hand Luke; Jacob remembers the dialogue from every movie he’s ever seen.

I’ve met so many parents of kids who are on the low end of the autism spectrum, kids who are diametrically opposed to Jacob, with his Asperger’s. They tell me I’m lucky to have a son who’s so verbal, who is blisteringly intelligent, who can take apart the broken microwave and have it working again an hour later. They think there is no greater hell than having a son who is locked in his own world, unaware that there’s a wider one to explore. But try having a son who is locked in his own world and still wants to make a connection. A son who tries to be like everyone else but truly doesn’t know how.

I reach out to comfort him but stop myself-a light touch can set Jacob off. He doesn’t like handshakes or pats on the back or someone ruffling his hair. “Jacob,” I begin, and then I realize that he isn’t sulking at all. He holds up the telephone receiver he’s been hunched over, so that I can see the smudge of black on the side. “You missed a fingerprint, too,” Jacob says cheerfully. “No offense, but you would make a lousy crime scene investigator.” He rips a sheet of paper towel off the roll, dampens it in the sink. “Don’t worry, I’ll clean up all the blood.”

“You never did tell me Theo’s motive for killing you.”

“Oh.” Jacob glances over his shoulder, a wicked grin spreading across his face. “I stole his sneakers.”

In my mind, Asperger’s is a label to describe not the traits Jacob has but rather the ones he lost. It was sometime around two years old when he began to drop words, to stop making eye contact, to avoid connections with people. He couldn’t hear us, or he didn’t want to. One day I looked at him, lying on the floor beside a Tonka truck. He was spinning its wheels, his face only inches away, and I thought, Where have you gone?

I made excuses for his behavior: the reason he huddled in the bottom of the grocery cart every time we went shopping was that it was cold in the supermarket. The tags I had to cut out of his clothing were unusually scratchy. When he could not seem to connect with any children at his preschool, I organized a no-holds-barred birthday party for him, complete with water balloons and Pin the Tail on the Donkey. About a half hour into the celebration, I suddenly realized that Jacob was missing. I was six months pregnant and hysterical-other parents began to search the yard, the street, the house. I was the one who found him, sitting in the basement, repeatedly inserting and ejecting a VCR tape.

When he was diagnosed, I burst into tears. Remember, this was back in 1995; the only experience I’d had with autism was Dustin Hoffman in Rain Man. According to the psychiatrist we first met, Jacob suffered from an impairment in social communication and behavior, without the language deficit that was a hallmark of other forms of autism. It wasn’t until years later that we even heard the word Asperger’s-it just wasn’t on anyone’s diagnostic radar yet. But by then, I’d had Theo, and Henry-my ex-had moved out. He was a computer programmer who worked at home and couldn’t stand the tantrums Jacob would throw when the slightest thing set him off: a bright light in the bathroom, the sound of the UPS truck coming down the gravel driveway, the texture of his breakfast cereal. By then, I’d completely devoted myself to Jacob’s early intervention therapists-a parade of people who would come to our house intent on dragging him out of his own little world. I want my house back, Henry told me. I want you back.

But I had already noticed how, with the behavioral therapy and speech therapy, Jacob had begun to communicate again. I could see the improvement. Given that, there wasn’t even a choice to make.

The night Henry left, Jacob and I sat at the kitchen table and played a game. I made a face, and he tried to guess which emotion went with it. I smiled, even though I was crying, and waited for Jacob to tell me I was happy.

Henry lives with his new family in the Silicon Valley. He works for Apple and he rarely speaks to the boys, although he sends a check faithfully every month for child support. But then again, Henry was always good with organization. And numbers. His ability to memorize a New York Times article and quote it verbatim-which had seemed so academically sexy when we were dating-wasn’t all that different from the way Jacob could memorize the entire TV schedule by the time he was six. It wasn’t until years after Henry was gone that I diagnosed him with a dash of Asperger’s, too.

There’s a lot of fuss about whether or not Asperger’s is on the autism spectrum, but to be honest, it doesn’t matter. It’s a term we use to get Jacob the accommodations he needs in school, not a label to explain who he is. If you met him now, the first thing you’d notice is that he might have forgotten to change his shirt from yesterday or to brush his hair. If you talk to him, you’ll have to be the one to start the conversation. He won’t look you in the eye. And if you pause to speak to someone else for a brief moment, you might turn back to find that Jacob’s left the room.

Saturdays, Jacob and I go food shopping.

It’s part of his routine, which means we rarely stray from it. Anything new has to be introduced early on and prepared for-whether that’s a dentist appointment or a vacation or a transfer student joining his math class midyear. I knew that he’d have his faux crime scene completely cleaned up before eleven o’clock, because that’s when the Free Sample Lady sets up her table in the front of the Townsend Food Co-op. She recognizes Jacob by sight now and usually gives him two mini egg rolls or bruschetta rounds or whatever else she’s plying that week.

Theo’s not back, so I’ve left him a note-although he knows the schedule as well as I do. By the time I grab my coat and purse, Jacob is already sitting in the backseat. He likes it there, because he can spread out. He doesn’t have a driver’s license, although we argue about it regularly, since he’s eighteen and was eligible to get his license two years ago. He knows all the mechanical workings of a traffic light, and could probably take one apart and put it back together, but I am not entirely convinced that in a situation where there were several other cars zooming by in different directions, he’d be able to remember whether to stop or go at any given intersection.

“What do you have left for homework?” I ask, as we pull out of the driveway.