Hidden atop another bar in Mount Vernon, this espionage-themed lounge is made for couples in search of a secret rendezvous.. In Short At the Midtown Yacht Club, patrons push a trick bookcase to gain access to this swinging, bi-level nightclub. Exposed brick walls are decorated with spy-cams, false passports and confidential documents. Six unique nooks, each with distinct furnishings--leather couches, tall cocktail tables, etc.--are augmented by two bars, one per floor. The upper level features a hardwood dance floor with DJs spinning techno and house; the lower level includes an oxygen bar featuring flavors like bayberry and lavender.