From a screenwriting book I've just read it makes the following point about pitches:
ie
When a great white shark starts attacking beachgoers in a coastal town during the high tourist season, a water-phobic Sheriff must assemble a team to hunt it down before it kills again.
A young female FBI trainee must barter personal information with an imprisoned psychopathic genius in order to catch a serial killer who is capturing and killing young women for their skins.
A treasure-hunting archaeologist races over the globe to find the legendary Lost Ark of the Covenant before Hitler's minions can acquire it and use it to supernaturally power the Nazi army.
See if that helps.
That sentence should give you a sense of the entire story: the character of the protagonist, the character of the antagonist, the conflict, the setting, the tone, the genre
ie
When a great white shark starts attacking beachgoers in a coastal town during the high tourist season, a water-phobic Sheriff must assemble a team to hunt it down before it kills again.
A young female FBI trainee must barter personal information with an imprisoned psychopathic genius in order to catch a serial killer who is capturing and killing young women for their skins.
A treasure-hunting archaeologist races over the globe to find the legendary Lost Ark of the Covenant before Hitler's minions can acquire it and use it to supernaturally power the Nazi army.
See if that helps.