Upper East Side apartment

A 14th-floor apartment in NYC located at the Fifth Avenue was remodeled in 2003 by a young architectural designer named Eric Clough. Owners didn’t realize until much later was that Mr. Clough had a number of other ideas about their apartment that he didn’t share with her. Mr. Clough hid a lot of puzzles, riddles, ciphers, and other hidden games. The owners didn't discover the first clue until living there for four months.