Alice

Mark thought he was finally rid of his abusive ex-wife Alice, who had beaten him to a pulp and tried to kill him. He now has a new life - he's married to the wonderful Diane, they have a café together and Mark enjoys a good social life with his brother and his family.
One day, however, Alice makes a return, and promises revenge on Mark and his family for leaving her. As time passes, Alice's actions become increasingly violent and dangerous, and Mark and Diane soon realise that she will stop at nothing to make sure they are all dead, one by one.

Huge thank you to @StormWhitaker for creating the perfect cover to this story!