Sentence:  A woman only discovered her 'family man' husband had led a secret <WSD>double life</WSD> as a spy after his death. Audrey Phillips, 85, was married to Glyn for 64 years but was unaware he had been working for the British Intelligence Force since he was 13. 
Meaning of the word marked with <WSD> tags:  The hidden, or more unusual, aspect of a person's life.