The Magdalene Diggers, book 1: The Smoke Hunter Jacquelyn Benson2016

Frustrated suffragette and would-be archaeologist Ellie Mallory stumbles across a map to a city that shouldn't exist, a jungle metropolis alive and flourishing centuries after the Mayan civilization mysteriously collapsed. Discovering it would make her career, but Ellie isn't the only one after the prize. A disgraced professor and his ruthless handler are hot on her heels, willing to go any extreme to acquire the map for themselves.

To race them through the uncharted jungle, Ellie needs a guide. The only one with the expertise is maverick surveyor Adam Bates. But with his determination to nose his way into Ellie's many secrets, Bates is a dangerous partner.