The story starts at Olive Torres Twin sister's wedding Ami Torres. She is marrying Dean Thomas. Olivie is not known for bad luck but Ami always has good luck her honeymoon is paid for and so is her wedding. Dean has a brother named Ethan, Ethen and Olivia HATE each other.
Climax
At the dinner they service seafood, Olive and Ethan are both allergic so they have an alternative. When Olive's speech starts Dean has this terrible look on his face, he throws up, and sooner than later the entire room is throwing up except Olive and Ethan. It was food poisoning. The dinner was canceled and everybody went to their hotel rooms
Falling Action
When Olive and Ethan are in the rooms with their sibling there siblings tell them to take their honeymoon in Hawaii since it is nonrefundable and already paid for. They both get a little upset when they have to go together because they don't like each other that much but they both end up going on the trip. The only problem was they Olive had to pretend to be Ami since it was nonrefundable in her name and it was too late to change it but Ami was also not the best lier.
Resolution
They finally get there and on the first day, Olive decides to go to the spa. At the end of her spa she seas her new boos. They get to talking and she ends up spilling out that she is a newlywed and he offers to take her and Ethan to dinner that night. When Olive gets back to the hotel room and tells Ethan they come up with a strategy on how they are going to act. With Olive not being the best liar, it is a little hard at first but they seem to figure it out.
On their way back from dinner they run into Ethan's old ex. She recognizes them first and Eathen tries to hide but she still walks over. When he sees him she introduces her new fiance and he freezes and introduces Olive as his wife. She is stunned but manages to keep it together she congratulates them and tells them they are going to get there for another 5 days while Olive and Eathen are there for 10. So now they not only have to avoid them but also pretend to be married when they see them
It's the last day live boss is there so all they have to do is avoid them for one more day.They are standing in line and are talking about how hard it is to pretend and Olive's boss is right behind them and hears them he proceeds to confront her and ask her why she couldn't just tell the truth and fire her. In the hotel when they are talking Eathen is super nice and caring to Olive which never happens he then tells her he likes her and as ever since they meet. They then exchange their dealing for each other and have a good rest of the trip.