Secret One

@gigstaggart on twitter. Any hints will be tweeted there. This contest has valuable physical prizes for the first that finishes all stages. First puzzle follows:

• IHWJTG R PPR GMI HYXGE GDS TIBTNV S LCIES WSJ PBU BIS FGI OSHJT OZDG XHI TZW BCJM QUDDTHJ BIS STDIK PWO UGCHIHAS LZT WEYDRESIWFG LHSL LS JXT AFV WSRK WOO OT KFKZ WZSI KV MWIFC XHJ TAL STDIK MWE AFUCIFPTAGC