There are 4 books in the The Letter Series series. The newest book is The Thief's Heart which came out in 2020.

1
The Last Letter

Book cover of The Last Letter
"Gripping historical fiction—A tale of two women finding meaning behind all that went wrong in their lives. A timeless tale of redemption with the best plot-twist at the end I've seen in a long, long time. Can't wait for book two!" New York
Times and USA Today bestselling author, Melissa…
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2
The Road Home

Book cover of The Road Home
THE ROAD HOME...The Long-Awaited Sequel to Award-Winning, Bestselling Author Kathleen Shoop’s The Last Letter…1891—Living separately for three years, fourteen-year-old twins, Katherine and Tommy Arthur, have done their best to make each boarding house feel like home. But unrest grows as they are driven to questionable actions just to survive. Meanwhile…

3
The Kitchen Mistress

Book cover of The Kitchen Mistress
THE KITCHEN MISTRESS--Katherine’s Story—The Letter Series—Book 3For every woman who’s had to choose between the secrets that protect her and the people she loves the most…1892—Des MoinesKatherine Arthur and her family are back and it’s time to collect the money Mrs. Mellet left them in her will. The tidy sum…

4
The Thief's Heart

Book cover of The Thief's Heart
For anyone who’s ever needed a second chance, to find love, to find the right path in life…Des Moines, 1892. After losing their promised inheritance, the Arthur family’s luck finally changes. An extraordinary woman, Violet Pendergrass, provides refuge for them to rebuild their broken lives. Or has she? Handsome fifteen-year-old…