The London rookeries are slums, rife with criminals, and shunned by the upper crust.

But someone there intends to murder one of England's greatest leaders, and Marcus Kane, Lord Chadwick, will follow every clue, even into the bowels of London's underground. But he can't find his way alone.

A partner is required.

Fantine (Fanny) Delarive is perfect. She knows the slums better any, has survived its labyrinth alone for years, and knows every criminal lurking in every dark corner.

Then, the investigation detours the pair into the bright...