The novels in this series are a continuatioin and should be read in order. 

Ancient Words

Book 1: Where Can I Flee set in 1861, 1862
Book 2: In the Shadow of Thy Wings set in 1863, 1864
Book 3: Out of the Ashes set in 1865, 1866 and an epilogue set in 1880

WCIF Paperback
WCIF Sharon
Shadow Paperback
Shadow Alicia 2
Ashes Paperback
Ashes Krista