What is the first crime depicted during Hitchcock's 1960 film "Psycho"?

Alfred Hitchcock's masterpiece "Psycho" is probably remembered above all for the sequence where the lead character Marion Crane (played by Janet Leigh) is brutally killed in the shower at the Bates Motel. But this is not the first crime depicted in the film. Marion herself is already on the run from an offence that she has committed.

The film opens with a scene in a Phoenix hotel where Marion, a real-estate secretary, and her boyfriend Sam Loomis are discussing their inability to get married because of Sam's debts. When Marion returns to work, she spots an easy “solution”: she decides to steal a cash payment of $40,000 entrusted to her for deposit at the bank, and to drive to Sam's home in Fairvale, California. Along the way she stops at the infamous motel.

There is an interesting interplay between the two crimes as the plot then unfolds. Marion's sister Lila arrives in Fairvale a week later and tells Sam about the theft; neither of them knows why Marion left her work and then disappeared. A private investigator named Arbogast is introduced to the plot; he has been hired to retrieve the stolen $40,000. Arbogast follows the trail to the Bates Motel and is eventually killed in a manner similar to Marion’s murder. Sam and Lila then follow the private investigator’s trail. But they narrowly avoid suffering the same fate as Marion and Arbogast.