They found Helen Lamb at the port.
She was walking towards the check-in area when Relf's officers moved to meet her.
Helen saw them and stopped.
"Ms Lamb," Relf said. "Detective Inspector Relf."
"I know."
"Would you come somewhere with us to answer a few questions?"
"Am I under arrest?"
"No."
"Then I'd like to know what you want first."
Eleanor stood several yards behind him.
Helen looked past Relf and recognised her.
"Dr Harcourt."
Eleanor stepped closer.
"We haven't met."
"No."
"How do you know me?"
"Adrian told me about you."
"When?"
"Before he died."
"What did he tell you?"
"That I might need to speak to you."
Relf watched Helen.
"You knew Bull?"
"Yes."
"Why haven't you contacted us?"
"He told me not to trust the police."
"Did he mention me?"
Helen looked directly at him.
"He said you were the exception."
Relf paused.
"Then perhaps you'll tell me what he wanted you to do."
Helen moved a hand towards her shoulder bag.
One of the officers stepped nearer.
"It's an envelope," she said.
"Slowly," Relf told her.
She opened the bag and took it out.
On the front, in handwriting Eleanor had seen throughout his notebooks, Bull had written:
DR ELEANOR HARCOURT
Eleanor looked from the envelope to Helen.
"Why do you have that?"
"He gave it to me."
"When?"
"Monday. The day he died."
"What time?"
"Just after five."
Relf glanced at Eleanor.
Bull had met Helen before going to the church.
"What did he say was inside?" Eleanor asked.
"That you'd understand why he'd given it to me."
Helen held it out.
Eleanor took it. The envelope was still sealed.
"Not here," Relf said.
Helen nodded.
"Somewhere private."
"There's a room we can use."
"A police room?"
"Yes."
She hesitated.
"You said Bull trusted me," Relf said.
"I said he made an exception."
"Then let's find out why."
Helen looked towards the ferry beyond the glass.
"Inspector, you're trying to understand what happened in the church."
"Yes."
"You need to start before that."
Eleanor kept the envelope between her hands.
"How much before?"
"He knew someone might try to kill him."
"When he gave you this?"
"Yes."
Relf said nothing.
"He went to the tower knowing that?" Eleanor asked.
Helen nodded.
Eleanor looked down at Bull's handwriting.
She had imagined him going there intent on completing the inscription, unaware of the danger except for the bell itself. If Helen was telling the truth, that was another assumption they would have to examine.
Had he simply taken the risk?
Or had he gone there expecting something to happen?
She turned the envelope over, looking for a date or another instruction.
There was nothing.
"Let's find somewhere to read it," she said.