An unseen story told from the perspective of JD Salinger's Holden Caulfield and more tales of the recurring character Seymour Glass could start appearing as early as 2015, film-makers revealed at the world premiere of documentary Salinger, at Colorado's Telluride film festival.

Five new Salinger books are expected between 2015 and 2020, the Daily Beast reports. They include The Last and Best of the Peter Pans, a 1962 short story featuring the Catcher in the Rye protagonist Caulfield, and A World War II Love Story, which is based on Salinger's brief marriage to Sylvia, a Nazi collaborator.

The other highly anticipated new works include A Counterintelligence Agent's Diary, based on the writer's experience interrogating prisoners during the final months of the second world war, and A Religious Manual, about Salinger's relationship with Advaita Vendanta Hinduism.

An unseen collection of short stories, The Complete Chronicle of the Glass Family, tells more of Salinger's recurring character, Seymour Glass, who is often said to be a self-portrait and who appears in A Perfect Day for Bananafish and in several novellas.

The documentary film on Salinger and a related book suggest the late author instructed his estate to publish at least five posthumous books, authorising a specific publishing timetable that would run from 2015 to 2020.

The book's co-authors Shane Salerno (who is also the film's director) and David Shields write in its introduction that they had three goals: "we wanted to know why Salinger stopped publishing; why he disappeared; and what he had been writing the last 45 years of his life".

After Salinger withdrew from public life in 1951, following the publication of Catcher in the Rye, rumours have swirled about what he was working on, but no one would break the secret. So far, no agent or publisher for the new works has been confirmed and Salinger's closest family have not formally contributed to the latest retelling of his life.