LONDON — U.K. financier and producer Bob Benton and producer Andy Brunskill have teamed to launch production company Sums Film and Media.The company will focus on innovative content for digital platforms and theatrical release, starting with “Phone Book,” a multi-narrative feature, which will see Academy Award-winning editor Angus Wall helm selected segments. The project, which has received development funding from the BFI Film Fund, is based on author Steven Hall’s “Stories for a Phone Book Page,” and draws together an ensemble of characters whose fates intertwine following a series of mysterious events. Individual character stories will be accessible via an interactive smart-phone and tablet interface, and will feed into and out of a theatrical feature storyline. Hall will adapt the book for the film’s central story with additional scripters contributing the branching strands. Malcolm Reeve will exec produce. Sums is also developing a teen gang war epic based on the non-fiction book “Teenage: The Creation of Youth 1875-1945″ by Jon Savage, and “The Winter Ghosts,” an adaptation of the novel by Kate Mosse, scripted by Rory Kinnear and co-produced with Ruby Film and Television.