The Children of the Work house series
The Girl in the Ragged Shawl
The Barefoot Child
The Winter Orphan
These three are a trilogy about children who are either left or forced into an orphanage and the man who rescuses them. All the children are different with their own lives but linked together because of Fate andone man who is driven to atone for his sin.
Begin by reading The Girl in the Ragged Shawl.