As they walked she told Ethan about the Mercers’ family meeting. He listened carefully, his eyes ahead on the path. “They’re going to look for me, Ethan, and it’s not like I covered my tracks.” She thought about every CSI episode she’d ever seen. It was ridiculously easy to trace peoples’ whereabouts, if you had an Internet connection and a witness or two. “I don’t know how long I have before they figure it out. And if they do, I’ll be the number-one suspect. The killer has made sure of that.”

They reached a promontory with a covered picnic area looking over the park. A fat raccoon glanced nonchalantly up from a McDonald’s wrapper as they approached, then waddled off into the underbrush. Emma sat on the top of the picnic table, rummaging in her backpack for a bottle of water. She took a long sip, then handed it to Ethan.

“All of us are in danger.” She looked up at him miserably. “You, me, my family. We have to solve this, and fast.”

He slid an arm around her and pulled her against his side protectively. She rested against his shoulder, breathing in the clean-laundry smell of his flannel shirt.

“Okay, so we’ve ruled out Laurel, Thayer, Madeline, Charlotte, Mr. Mercer, Becky, and the Twitter Twins,” he said, ticking Sutton’s friends and family off one by one. “Are we totally sure it’s not, like . . . a random crime? I mean, maybe it was a drifter or something?”

Emma shook her head. “The killer knows too much about Sutton for it to be random. Where she lives, what her schedule is, the importance of her locket . . . the killer took it right off her neck and left it for me, knowing that I wouldn’t be a realistic stand-in unless I was wearing it.” She shivered. “This murder was personal.”

Ethan nodded. “I guess you’re right.”

“You know who we haven’t looked into?” Emma said quietly. “Garrett.” She filled Ethan in on Garrett’s comment that she “barely knew” Nisha, and Laurel’s revelation that Garrett had a temper with Sutton.

“Wow.” Ethan rubbed his jaw thoughtfully. “I don’t really know much about Garrett. We had AP History together last year, but we don’t really move in the same circles. I know he was out a lot for some kind of family emergency in the spring, but I never found out what the story was.”

Emma chewed on her thumbnail. On the one real date she’d had with him, Garrett had mentioned something about his sister. Charlotte was there for me during everything that happened with Louisa, he’d said. At the time she hadn’t been able to come up with a subtle way to ask what he was talking about. “What about Louisa? Do you know her?” she asked.

He shook his head. “Not that well. She kind of keeps to herself.”