Here’s the deal In english explanation

Jame: "Why did she storm at you?" Marry: "Oh, here's the deal. She caught me red-handed while I was trying to hide her backpack.

Here's the deal: there is something wrong with our book, so I need some editors to go with me for a doublecheck before publishing.

Here's the deal: I'll divert my Dad's attention away from the main door while you sneak out.

Here's the deal. You stay here to look after these kids, and I go out to buy some food.