After the worst year of her life, Martha Munro is looking forward to getting back to the job she loves. She's one of the best and brightest young detectives in the Met, but she's immediately put on a seemingly pointless case . . .

Martha is ordered to investigate a spate of cat abductions in leafy south London. Each time, the missing moggy turns up unharmed days later.

But then one family receives a terrifying message: Next time it's the kids.

And an ambulance is sent to the children's school. A sinister threat by someone playing a deadly game of cat and mouse.

That same week, another Dulwich resident plunges to her death from an upstairs window. It looks like a tragic accident. Until Martha discovers she was pushed.

Someone is setting a dangerous trap for Detective Martha Munro — and they have eyes and ears everywhere.

Martha can't let her family get hurt again. Can she outsmart this devious killer without falling into the trap?