Amazon.com is going from peddler to producer. In its first feature-film venture, Amazon has optioned screen rights to Keith Donohue’s novel “The Stolen Child.” Amazon will move to secure a filmmaker and then a studio partner to turn the fantasy into a live-action feature. Novel by first-time writer Donohue combines literature and fantasy and covers issues of identity. A 7-year-old is kidnapped by forest-dwelling changelings, who replace him with a look-alike. Book tracks the changeling’s attempt to meld into a family and the boy who roams the woods with a pack of feral children.