This is a 2002 novel, set in Victorian London.
Sue Trinder is an orphan, left as an infant in the care of Mrs. Sucksby, a "baby farmer," who raises her with unusual tenderness, as if Sue were her own. Mrs. Sucksby also hosts a transient family of petty thieves — fingersmiths — who live in the same London slum as the children.
One day, Gentleman, who is an elegant con man, makes an enticing proposition to Sue: if she wins a position as the maid to Maud Lilly, a naïve gentlewoman, and aids Gentleman in her seduction, then they will all share in Maud’s vast inheritance.
But nothing is as it seems in this novel of thrills and reversals.
The novel was adapted by the BBC as a three-part costume drama in 2005 (image above). It features Sally Hawkins as Sue Trinder and Imelda Staunton as Mrs Sucksby, with many other well-known actors and actresses such as Elaine Cassidy, Charles Dance and Patrick Troughton.