Revenge is a dish best served cold and in full measure.

Lisa's life was destroyed by her husband Jack who when he divorced her, he made sure that she was left with nothing - her children were gone and she was left deranged and dejected with alcohol her only solace. Now she has the evidence of her husband's serial adultery and she realises that there life together was a lie and that he was constantly comparing her to other women keeping score in his journal. One of these women was her own sister and with the journal now in her possession she seeks to wreck revenge on Jack and get her children back and her previous life back.
Not much of a preamble but straight into the plot with an element of darkness around Lisa and to what extent she will go in her search for revenge.