Grace wants a family - and she's getting to the point where if she doesn't have a baby soon, she may never be able to have one - Sure she can always use IVF - but that takes money - and LOTS of money. She has a good job, but it's not THAT good
Grace also believes in love and hope - she doesn't do one night stands because her heart doesn't let her.
Charlie is a good guy - he's loved and been hurt and refuses to let it happen again. But he's close with his family and they all want him to be happy.
So when the persistent nagging for him to be set up on a date by his ma for his sister's wedding gets to be too much, Grace decides to help out a friend and let them think he's not alone.
Only his family is a lot more involved than she realized. What turned into harmless fun to get his family off his back for a little bit turned into a 2 week wild ride, Grace knew her heart would be shattered by this man.