For a three-act plot analysis, put on your screenwriter’s hat. Moviemakers know the formula well: at the end of Act One, the main character is drawn in completely to a conflict. During Act Two, she is farthest away from her goals. At the end of Act Three, the story is resolved.
Act I
Stevens embarks on a road trip through the West Country, with a bunch of mishaps along the way.
Act II
Stevens finally meets up with Miss Kenton in Cornwall. They leave on friendly terms… but she's staying with her hubby. Stevens is sad.
Act III
Stevens stops by Weymouth on his way back to Darlington Hall. At Weymouth, he thinks back on his trip and struggles to come to terms with all his regrets.