An engaged young couple finds their lifetime of happiness unexpectedly compromised by a pushy minister who insists they successfully complete his comprehensive marriage-prep course before exchanging wedding vows in a matrimonial comedy starring John Krasinski, Mandy Moore, and Robin Williams. Sadie Jones (Moore) has always longed to marry the man of her dreams in her family church. Though she found her lifetime companion in Ben Murphy (Krasinski), Sadie is distressed to learn that St. Augustine's has only one wedding slot available over the next two years. While Sadie and Ben do qualify for the slot, charismatic St. Augustine's minister Reverend Frank (Williams) won't wed the couple until they agree to attend his two-week prenuptial course. Now, as their wedding date draws near, Sadie and Ben must attend every one of Reverend Frank's exhausting classes and complete a series of rigorous homework assignments designed specifically to test their dedication to one another and ensure that their union will have a sound foundation.