Tiffany Rosenhan — great-granddaughter of Oscar winner Mary Astor (most famous for starring in “The Maltese Falcon” with Humphrey Bogart) — has written a young adult romance/spy thriller destined for the silver screen.

Producer Webster Stone, who optioned the book before publishers got to read it, is talking with Danny Strong, who adapted “The Hunger Games: Mockingjay, Parts 1 and 2” for the screen.

“It’s Buffy meets Bourne,” says Strong.

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