‘If that’s what you want, sure.’

‘Of course it’s what I want. Don’t worry about Rosario. Like you said, I’m the boss. And I want you on board. So do you need anything?’

Foster leaned forward and pulled a black plastic watch from his jacket pocket.

‘I need you to wear this.’

Keller took it from him and turned it over in her hands.

‘Wow,’ she said sarcastically, ‘this looks like the height of fashion.’

‘It’s called a StrayStar. It’s got a built-in GPS tracker, and a panic button. If anything happens and I’m not with you, press the button and I’ll find you. I won’t be far away.’

Keller slipped it on.

‘Anything else?’

‘Not much,’ Foster said. ‘Just a couple of ground rules. Wear the watch. Stay around people you know. Don’t get caught on your own, if you can help it. And don’t trust anyone until we work out what’s going on. Can you live with that?’

‘Absolutely. If that’s what it takes.’

‘Have you had any thoughts about who might want to threaten you?’ Foster asked. ‘Sometimes people have a gut feeling, so if anything or anyone comes to mind, don’t keep it to yourself.’

‘I’ve thought about it over and over, but I’ve no idea who would do this. If anything comes to me, though, you’ll be the first person I tell.’

Keller stood up and headed off to the locker room to shower. Foster smiled and shook his head as he watched her walk away. On her own. Breaking one of his rules already.

CHAPTER 6

PEOPLE LIKE KELLER rarely liked a guy in a suit telling them what to do. Even though that was exactly what she had hired Foster for. He wondered how well the tennis star would take to his rules over the coming days. It was too hot to stay in the sun, so he used the fifteen minutes while Keller took a shower to get familiar with the layout of the place. Just in case. Foster was a just in case sort of guy. Wimbledon was roughly the shape of a teardrop, nestled between a couple of tree-lined avenues that curved around Centre Court, a boxy green fortress of a place, with ivy climbing up the sides and the world’s most expensive front lawn in the middle. In its shadow was No. 1 Court, a royal green doughnut built of similar proportions. The two stadia were surrounded by a further seventeen Championship courts and twenty-two practice courts, including the one Keller had recently vacated.