The Winchester House. Byrne Bloodline, #1

The Winchester House: (built 1884- abandoned 1922) When Lucia and her family move in to the infamous Winchester House, she becomes a magnet for the ghosts that haunt this ancient mansion. The family's lives are filled with terror. Day in and day out, one tragedy after the next until they contact a paranormal ghost consultant. These consultants aren't just any regular "ghost hunters" they are the Byrne Ghost Hunting Inc.  Anthony Byrne is haunted by the love of his life, and knows he will never find another to replace her.
Ghosts am I right? He buries himself in work to try and pretend that every day is like the last, when his mother tells them they are going ghost hunting. It's just the perfect kind of case to fill his thoughts. That is until he gets to The Winchester House, meets Lucia and the nasty ghosts.