The neighbor two doors down
(Book)

"Five years ago, she tried to kill the man who abducted her sister.  Now she's living next door to a psychopath hiding in plain sight.  Allison Smythe is barely clinging to sanity.  After blaming and nearly killing an innocent man for her sister's unsolved kidnapping, she's ready to consider a fresh start.  But just as she's settled in a new city, she's horrified to spot the villain who took her sibling residing peacefully on her street.  Arguing with the police over the need for more evidence and with her therapist about her deteriorating mental health, Allison grits her teeth and attacks the dangerous problem alone.  But the more she digs, the more questions she unearths...and she fears her fragile mind could be playing nightmarish tricks.  Will her desperate attempt to deliver justice end with a tragic repeat of history?"--Back cover.