Tree of Hands (released in the US as Innocent Victim) is a 1989 British psychological 
drama film directed by Giles Foster and starring Helen Shaver, Lauren Bacall, Malcolm Stoddard and Peter Firth. It is based on the 1984 novel "The Tree of Hands" by Ruth Rendell.
Plot.
Benet Archdale (Helen Shaver), a London-based best-selling author who has just written a controversial novel, lives alone with her young son. Benet's mother, Marsha (Lauren Bacall), visiting from the United States, is a manic-depressive who has psychotic episodes. When Benet's young son dies, Marsha kidnaps a local child to serve as a substitute. Benet believes she should return the child but upon investigation she finds out that the child has been severely abused by his parents. After the child's disappearance, the parents are charged with the murder.