The Guardian (1990 film)

The Guardian is a 1990 American horror film cowritten and directed by William Friedkin. It stars Jenny Seagrove as a mysterious nanny who is hired by new parents, played by Dwier Brown and Carey Lowell, to care for their infant son the couple soon discovers the nanny to be a Hamadryad whose previous clients children went missing under her care. It is based upon the novel The Nanny by American novelist Dan Greenburg.

The opening cards explain that ancient druids worshiped trees, sometimes offering them human sacrifices. Some of these trees were connected with evil.At the Sheridan home, Molly and Allan Sheridan head off on a trip, leaving their two children in the care of their nanny, Diana Julian. Once alone and with the children sleeping, Diane kidnaps the daughter. Molly realizes she left her glasses at the house, and upon returning she sees that her daughter is missing. Diana, out in the forest, approaches a giant, old, gnarled tree, and holds up the baby, which then disappears from her hands. The roots of the tree show the babys face, as it has been sacrificed to keep the tree alive. As Diana sits on the ground near a pool of water, her reflection disappears, leaving that of a growling wolf. ........

Source: Wikipedia