Archie nodded, but he didn’t think they’d find Gretchen in any of the other footage. Leo or someone on the island had reviewed all the video files before they turned them over, and Leo had only mentioned the boathouse camera.

“This was all for you,” Susan said stiffly. Her eyes were on the pillow in her lap. Her fingers were still tugging at the thread. “She risked coming back here, risked getting caught, because it was your birthday,” she said.

Henry had stopped pacing. The air in the room felt cold and still.

Archie didn’t know what she wanted him to say. It was true. He should have seen it coming. He should have known that Gretchen would use the occasion to make a point. He should have been prepared.

“But it wasn’t enough for her to see you,” Susan said, pulling out another thread. “She wanted you to know. That’s why she sent me that message. That’s why she let herself be filmed by the security camera. Why she probably murdered that girl. She wanted you to know that she came back on your birthday.” She fixed her gaze on him, eyes like green glass. “She wanted you to see her”—her mouth twisted in disgust—“all over you.”

Archie tried to meet her eyes, but found it physically painful. He searched for something else to look at, anything but her. His hands. The coffee table. Of all the people in the world, Susan was the last Archie would have chosen to see that video, though he would never tell her that. Even Ginger had abandoned him, retreating under the coffee table and staring up at him with abject disappointment. Henry had gotten very interested in something out the window.

“How was this supposed to go, Archie?” Susan demanded. “Did she think you’d like the performance? Are you flattered? Does it turn you on?”