A serial killer who dumps the victims' bodies in Soho Square. A sleepless detective thwarted by his box-ticking boss.

Detective Rob Miller thinks he's seen it all, but this murder scene takes his breath away.

The victim is bound and gagged, with whip marks on his back. The location is one of the busiest squares in London. The cause of death appears to be strangulation.

Murder or a game gone wrong?

The prime suspect is the victim's partner. Under pressure from his superiors, Rob makes an arrest despite his doubts.

But another body is found: bound, gagged and dumped in the middle of central London. Again, there are no witnesses.

Now Rob's on the hunt for a serial killer with a fetish - and a talent for staying invisible.

Then the killer makes it personal . . .