From the Bitter Lemon Press website:
Davide Marengo's film of Night Bus is to be screened on June 6 and 7 in London at the Riverside Studios, Crisp Road, Hammersmith, London W6 (www.riversidestudios.co.uk). The film is a fast-moving adaptation of the thriller by Giampiero Rigosi and stars Giovanna Mezzorgiorno, seen recently in Love in the Time of Cholera.
Unfortunately this clashes with Crimefest, else I'd be interested. Read the Euro Crime review of the book, here.