Description:-

A Conjuring of Light (A Darker Shade of Magic #3) :
The precarious equilibrium among the four Londons has reached its breaking point. Once brimming with the red vivacity of magic, darkness casts a shadow over the Maresh Empire, leaving a space for another London to rise. Kell - once assumed to be the last surviving Antari -begins to waver under the pressure of competing loyalties. Lila Bard, once a commonplace but never common thief, has survived and flourished through a series of magical trials. But now she must learn to control the magic, before it bleeds her dry.

A Gathering of Shadows (A Darker Shade of Magic #2) :
Kell is one of the last magicians with the ability to travel between parallel universes, linked by the magical city of London. It has been four months since a mysterious obsidian stone fell into his possession and he met Delilah Bard. Four months since the Dane twins of White London fell, and the stone was cast with Holland's dying body back into Black London. Now Kell is visited by dreams of ominous magical events, waking only to think of Lila.

A Darker Shade of Magic:
Most people only know one London; but what if there were several? Kell is one of the last Travelers magicians with a rare ability to travel between parallel Londons. There is Grey London, dirty and crowded and without magic, home to the mad king George III. There is Red London, where life and magic are revered.