Lasser is on cloud nine but murder soon brings him down to earth.
A sunny afternoon in the park. Children at play, families picnicking on the grass and a man pushing an old pram, a pram that contains horrors beyond reckoning.
DS Lasser is happy, engaged to the woman of his dreams, just back from a two-week vacation. Life is sweet.
But it only takes one phone call, telling him that a local sex offender has been mutilated and murdered and all thoughts of harmonious bliss are quickly annihilated.
Someone is stalking the streets of this down-at-heel northern town, someone with a burning hatred and a long list containing the names of the guilty.
As if things weren't bad enough, a local reporter is leading a witch-hunt, determined to lay the blame for the killings at Lasser's feet.
As the nights draw in and the body count rises, Lasser must hunt the maniac who is spiralling out of control. Though he soon comes to realises that the killer, even in his madness, is working to an agenda.
And he isn't working alone.