Meanwhile, she is shocked to discover that her younger son's new best friend is the nephew of organised crime boss Chilli Franks - the man who has held a grudge against Helen's family since her father first put him away in the 1990s.
As her personal and professional lives collide, Helen finds herself in mortal danger as she races to track down the serial killer and restore safety to the streets of Hampton.
'Gripping' Clare Chase'Ingenious' Merilyn Davies
'Kept me guessing until the end' Joy Kluver
'A real adrenaline rush' Kate Rhodes
'Compelling' Sarah Ward
'Unforgettable' Louise Beech