Elisa Harper wakes up in Las Vegas to find she accidentally married Liam Weston, a charming but chaotic musician. They discover they must stay married for seven days and complete a series of wild “newlywed challenges” to win $7 million. Along the way, Elisa's controlling fiancé Derrick and Liam's obsessive fan Missy cause chaos, but Elisa and Liam slowly fall for each other. In the end, after betrayals, reconciliations, and near-disaster, they prove their love is real, win the prize, and choose each other for good.