When former child soldier Baba rescues Freddy from a sexual assault, something dark is ignited in them. The pair's lust for each other takes over and creates a truly deadly duo. DS Lola Franks and DI Jackson Mendy get thrown together to investigate the murder of the pair's first victim. Jackson's history of working in police anti-corruption infuriates Lola, so too does his firmly held belief that no one can ever be held entirely responsible for their actions.

Lola and Jackson find one thing they can agree on after interviewing Freddy. Freddy and Baba seize upon an opportunity to solve two problems with another killing.

Freddy and Baba flee the city with victim number three in the boot of their car, while Jackson and Lola make a breakthrough over a cup of green tea.

It looks like Baba and Freddy have got away with murder, and celebrate with a trip to Freddy's old school, while Lola and Jackson are wandering around in search of a stick.

Freddy's dark history surfaces as she and Baba don Halloween masks to gain entry to her old school. Jackson and Lola find evidence that links the pair to the third victim, but will they join the dots in time to save a fourth?

It looks like the end of the road for Freddy and Baba, trapped in a remote cottage by Lola, Jackson and a squad of armed response officers. With the trail behind them strewn with bodies, it seems unlikely they will escape the reckoning.