The completed film is inspired by the Watergate scandal, in which the administration of US president Richard Nixon attempted to cover up its involvement in the 1972 break-in of the Democratic National Committee headquarters at the Watergate Office Building in Washington D.C.
The film centres on a transcriber who is thrust to the forefront of events when she obtains the only copy of the 18 ½-minute gap in the president’s tapes.
It debuted at the Woodstock Film Festival in the US last year, going on to play events including Tallgrass and Gijon.
18½ stars US actress Willa Fitzgerald, whose credits incude Amazon Studios’ series Reacher.
Mirvish and Daniel Moya wrote the screenplay, and produced the film alongside Terry Keefe.