God Storm by Solitaire Townsend

A female gladiator's vow.

A stolen child.

A storm to end empires.

In an oil-fuelled Roman Empire which never fell, Arrow - a gladiatrix turned governess - must rescue Livy, the child she never meant to love, a girl who could tear down the world.

When Livy is abducted during a devastating Godstorm, Arrow must unleash years of the gladiator training she'd sworn to forget in order to save her. Defying her owner, a heartless Consul, Arrow turns to her ex-lover and the illegal druid underworld in a desperate attempt to rescue the girl she has tried not to think of as her own. 

Her search will take her across Londinium, a city of petrol-powered chariots, to the pagan Old Town, and eventually the edge of the known world: the Amazon, where destiny and destruction intertwine. 

Facing battle and betrayal Arrow must choose: reclain her past as a killer - or risk everything for the child who might call her 'mother'.