English Other Cinema, Film, TV, Drama listening and comprehension/understanding spoken English

I don't understand what Henry is saying to his daughter.

He says: "Ah! Well, let's not brood about it. A ...........is the best thing."

And she says: "He's bothered. All he thinks about is crime, he sees crime everywhere."

Context: they are talking about Edward. He's a criminologist. Henry didn't like him, because he was kind of dating his daughter. And now she's telling his father that Edward has gone. And Henry is quite happy with this news.

Link: https://youtu.be/DEJXEZdMGEI

Time: 6:23 ---> 6:24

Thanks!