Fourteen Days — Steven Jenkins

Workaholic developer Richard Gardener is laid up at home for two week's mandatory leave--doctor's orders. No stress. No computers. Just fourteen days of complete rest.
  
Bliss for most, but hell for Richard... in more ways than one. There's a darkness that lives inside Richard's home; a presence he never knew existed because he was seldom there alone.
  
Did he just imagine those footsteps? The smoke alarm shrieking?
         
The woman in his kitchen?
 
His wife thinks that he's just suffering from work withdrawal, but as the days crawl by in his solitary confinement, the terror seeping through the walls continues to escalate--threatening his health, his sanity, and his marriage.
 
When the inconceivable no longer seems quite so impossible, Richard struggles to come to terms with what is happening and find a way to banish the darkness--before he becomes an exile in his own home.