Apex Gallery is an art gallery created for the 1997 adaptation of the Agatha Christie novel The Pale Horse. Donald, a friend of Mark Easterbrook, owns the gallery. Mark has a studio above the gallery. Later, Kate Mercer stays in the studio under the guise of Mark's estranged wife as a bait for whatever move the "murder for a bet" scheme would take. The market researcher Eileen Brandon visited the gallery. Unknown to everyone and even Eileen herself, she was making implementing one of the preliminary steps of the murder scheme.
30 Market Place, St Albans was used as the filming location for Apex Gallery, although in the film the gallery is situated in London.