Dead Man Talking

"Jazmin Dawson, Spy Girl, is back ~ just in time to save the world again. Well, not quite. But Jazmin does have a two-cake problem on her hands, what with looking after the new weird twins at her learning centre, and the fact that she's Enemy Number One with the class bully.
Meanwhile, Jazmin's secret-agent mum, Assia, also has problems of her own to deal with. She is trying to identify a man found hanging from Blackfriars Bridge in the early hours of the morning. When the trail leads her to a long-buried secret, Assia is forced to confront a man more evil than she could ever imagine.
The trouble is, Jazmin has got there first."