Dangerous Obsession

Dangerous Obsession is a psychological thriller written by N. J. Crisp which premièred at the Churchill Theatre, Bromley on 9 November 1987.
A film, very loosely based on Crisp's play, was filmed in 1999 as "Darkness Falls", starring Ray Winstone, Tim Dutton and Sherilyn Fenn. N. J. Crisp's name does not appear on the titles.