Fenton’s choice of words made Charlie feel uneasy. Had Ruth confided in him about Aidan’s bizarre confession? No, it didn’t fit. Made herself known to you. That implied Ruth was someone the police might either want or need to know about, that there was a pre-existing connection of some sort between them. Charlie couldn’t understand it.

‘Do you know a Mary Trelease?’ she asked.

No adverse reaction to the name. Fenton considered it, then shook his head.

‘Is that CCTV?’ Charlie was looking at the lodge’s roof. She’d spotted another camera on the other side of the porch, above a ground-floor window. Was that why there were leaves clinging to the house’s every surface, for camouflage? ‘When were the cameras put in?’

‘Why do you want to know that?’ asked Fenton.

Charlie substituted a smile for an answer.

‘The park had an infestation of teenage thugs a while back. Ruth suggested installing CCTV. The council thought it was a good idea.’ His tone was defensive.

‘When you say Ruth’s a private person . . .?’ Charlie began.

‘I don’t like the slant of your questions. Ruth’s a perfectly ordinary woman and an excellent tenant. She takes her responsibilities seriously, that’s all. Hers is a service tenancy.’ Fenton sighed, as if he’d been tricked into saying more than he wanted to. ‘The lodge tenant, in exchange for a much-reduced rent, is supposed to be of assistance in the park when necessary, particularly in emergencies and out of hours. If someone falls down and breaks their leg on the path, Ruth would be expected to get involved—she’s got a list of emergency numbers, but she’d be the first point of contact.’

‘Most of the private people I know wouldn’t live in a public park,’ said Charlie, guessing that Fenton had been surprised by Ruth’s suggestion of installing surveillance cameras, or else why the guarded reaction? Had it been a suggestion or a request, a plea? What was it about his model tenant that Fenton was withholding out of loyalty?

His resistance was like bellows to a fire. Charlie was tempted to run up the steps and into Blantyre Lodge after the men from Winchelsea Combi Boilers. How much of Ruth Bussey’s home would she be able to see before Fenton dragged her out? Mad people’s houses had a distinctive look about them; you knew instantly. She sighed. That way lay an official complaint, which was all she needed. She slipped the article from the Rawndesley and Spilling Telegraph out of the coat’s pocket and put it in her bag.

‘Put that back,’ Fenton snapped. Oh, he knew Charlie’s history all right, and she knew his type. He wouldn’t have dared take that tone with the police under normal circumstances. Only with an officer he knew had been disgraced and nearly fired.

She’d changed her mind about giving him the coat. ‘I don’t feel comfortable about leaving this with a stranger,’ she said. ‘Ask Ruth to make contact with me again if she wants it back.’