Charlie knew she didn’t have long to compose herself if concealment was her preferred option, and all her instincts were screaming at her to conceal, withdraw, hide herself away. To demand an on-the-spot explanation from Ruth would constitute exposure on a level that, in her state of shock, she couldn’t even contemplate. No, she must avoid a confrontation at all costs, or something disastrous would happen: she’d end up attacking Ruth physically, or become hysterical. Later. Deal with it later.

She blinked furiously to banish the tears that had sprung up out of nowhere, and tried to focus on the white bookshelves on the opposite wall that sagged slightly in the middle and made the hallway half as wide as it would otherwise have been. Ruth was evidently a collector of self-help books as well as the self-appointed archivist of Charlie’s disgrace. In a better mood, Charlie would have found these titles amusing: What if Everything Goes Right?, The Power of Now, What You Think of Me Is None of My Business.

She didn’t know what she thought. All she knew was that her insides had liquefied, she felt as if she might throw up and she wanted desperately to leave this house.

‘I asked my landlord to install CCTV when I first noticed the man hanging around,’ said Ruth. ‘He thought I was making a fuss about nothing, but in the end he agreed. Some rowdy lads had colonised the park at night, and I managed to persuade Malcolm that we could kill two birds with one stone. By the time the cameras were in, the man had stopped walking past. I didn’t get him on tape until yesterday.’

Charlie wondered if Ruth had videotapes of her from two years ago, old news reports, the press conference she’d given, the extended interview she’d agreed to at the insistence of the press office, when public opinion was still violently against her three months after the scandal had broken.

Later. Not now. There were other things to think about, like fighting back: finding out everything she could about Ruth Bussey and using it to devastate her sad, inadequate little life. At the moment, Charlie told herself, the advantage was hers; Ruth didn’t know she knew.

She watched the grainy image on the screen change, saw a man in a woolly hat approach the park gates with a black dog. ‘Has Aidan seen this?’ she asked. If by some remote chance Bobble Hat was spying on Ruth, did Aidan know about it? Did he know who the man was? Spying on someone who spied on others, who broke into their private pain and . . .