The Londo Chronicles3 books in series
The Apothecary Publisher's Summary
"In the year 2525, who is keeping man alive?
Step back in time to an Edwardian London blanketed by a nuclear winter, where humans are ruled by mysterious overlords and love is forbidden. Strict laws keep citizen in check, until one man decides he's had enough.
His desperate act starts a cascade of events that rips Londo City apart and fractures longstanding loyalties - including those of the two brothers who rule Londo and two sisters who decide to follow their hearts, no matter the cost. As the sisters fight for their lives, they uncover dark truths about themselves - and the devastating secret behind human survival.