“How long she’s been dead isn’t going to be clear to everyone.”

“You saw her body. What’s left of it.”

“It all depends on the interpretation.” He makes his point in a way that’s disturbing, as if it might be one that’s been made before.

“The ‘interpretation’?” I repeat rather indignantly. “It’s clear she’s been dead for months.”

“Clear to me, but I’m not most people,” Benton says. “It depends on what TV shows they watch. They hear the word mummified and expect she was wrapped in bindings and found in a pyramid.”

I can barely make out the charter school and biotech buildings we pass, the lighting in most parts of Cambridge notoriously bad.

“It doesn’t help matters that he was at Logan around the same time you got the anonymous e-mail relating to Emma Shubert’s disappearance.” He gets to that, and nothing would surprise me.

“He’s never been to Alberta, Canada, and wouldn’t know the first thing about anonymizing software or proxy servers, Benton.”

“As far as anyone knows.”

“What possible motivation could he have, even if he were able to?” I ask.

“I’m not the one who thinks he might.”

“Others think he could have something to do with Emma Shubert.” I want him to spell it out.

“Or have something to do with what was e-mailed to you. It’s all part of the same discussion,” he says, and it’s ridiculous, and I tell him that, but I’ve seen ridiculous things before, the wildest of goose chases.

I know better than to dismiss any notion investigators might get into their heads.

“I’m worried it’s someone who knows him, Kay.”

“These days anybody can know anybody, Benton.”

“A paleontologist has vanished and is presumed dead, and you’re sent a photo of a severed ear,” he says. “Mildred Lott has vanished, her husband on trial for her murder, and then his helicopter films you while you’re getting Peggy Stanton’s body out of the bay just hours before you’re supposed to testify. I’m worried whoever’s doing this—”

“Whoever? As in one person?”

“Connections. There are too many. I don’t believe it’s coincidental.”

“You think it’s one person doing all of it?” I ask.

“If you want to get away with something, do it by yourself. And I worry this person knows Marino, knows you. Maybe knows all of us.”

“It doesn’t have to be someone who knows him or any of us,” I disagree. “If you search Peter Rocco Marino on Twitter you can find him. You can find so much about any of us on the Internet it’s rather terrifying.”

“Why would this person look for him on Twitter to begin with? Unless there’s a personal reason to get him into serious trouble?”