The Watcher by Charles Maclean:
It starts off with an ordinary man preparing a surprise for his wife's birthday, and for reasons unknown he does something brutal and horrifying. In trying to find out why, we're lured into his world of possible past lives. Is he coming apart at the seams, paranoid and schizophrenic - or does his psychiatrist have a sinister agenda? Not a book to read in a darkened room by yourself!
steve.kerri@clear.net.nz

Thanks for making me find a cute picture to pep me up!
http://veganmedusa.wordpress.com/2010/10/10/hour-10-mini-challenge/