When a development in South London catches fire mid-construction, a close-knit team of fire fighters runs in to save a man spotted at the window.

They come out without a body. They quit the service. They plan never to speak to each other again.

Five years later one of them is set alight at his own wedding. Soon after, a second is found, nothing but a smoking corpse. It appears that someone knows what they did that night. What they chose over their duty. And there are still three men left to burn . . .

DI Alex Finn and his new partner DC Mattie Paulsen are an unlikely pairing, but they need to discover who is behind these killings before the next man faces the fire.