25: Charlie gives Teresa Wright a ring. Teresa notices an engraving. It's the first time we see Charlie angry with Teresa and it's the first bit of evidence Teresa has her uncle is a killer. Note the title of the movie involves doubt: 25 is when Teresa's doubt has reason to start. The birth of something new.
45: An FBI agent enters the home and asks questions about Charlie. Teresa has no doubt about her uncle, she wants to protect him: "My uncle doesn't want to be bothered by lots of questions." The situation escalates as law enforcement arrives in the home. Now that I'm aware.
60: Teresa finds a newspaper in the library. "Where is the Merry Widow Murderer?" asks a headline. We read an article in the paper, we learn as she learns. We listen to the music as it becomes more dramatic and warped. She sees names. She looks at the ring Uncle Charlie gave her at 25. The initials on the ring match the initials in the paper, proof her uncle is probably a murderer. Teresa's doubt is growing and there is no stopping it, there's no going back to the world of no doubt about Uncle Charlie. There's no going back now.
-45: Just a few minutes after the library scene, Charlie asks where Teresa is - we begin to suspect Teresa is in danger. Teresa is in the kitchen with her mom as her mom hums a waltz. Teresa can no longer listen to the waltz because it reminds her of Charlie and asks her mom to stop. Teresa experiences intense inner turbulence. The discovery is that Uncle Charlie is probably going to try and kill Teresa and Teresa can no longer do nothing about her uncle. Discovery.
-25: Teresa walks along the sidewalk with FBI men and a friend. Uncle Charlie and Teresa talk a bit. There's tension and a new look on Teresa's face. There's talk about the Merry Widow Murderer being caught. Uncle Charlie walks up the steps and turns to look at Teresa. Uncle Charlie realizes Teresa isn't convinced he's innocent and he experiences intense inner turbulence. Teresa's doubts turn to anger and fear. Uncle Charlie carries his inner turbulence to the end when he tries to kill Teresa on the train. The final turning point.