Case Brief Slides Agent Mission
CASE BRIEF
Solving the Mystery of the Main Idea
Top Secret
What is the Main Idea?
The Big Secret
The Main Idea is what the whole story is mostly about.
Aha!
Finding the Clues
Supporting Details are like clues.
They tell us more about the Big Secret.
They prove the story is about that idea.
Evidence Check 01
Look at these clues. What is the Big Secret?
Umbrella
Rain Clouds
Rain Boots
The Big Secret is: It is a rainy day!
Evidence Check 02
Sam put on his jersey. He grabbed his soccer ball. He ran out to the green field to play with his friends.
Clue: Jersey
Clue: Soccer Ball
What is the Big Secret?
A) Sam likes to sleep.
B) Sam is playing soccer.
C) Sam is at the store.
Time for Fieldwork
Open your Case Files and find the Clues to solve the mysteries!
Circle your answers
Write down the details
Earn your Detective Badge
Clue Matching Worksheet L1 Case File: Level 1
Main Idea Detective Agency
Agent Name:
Mission Date:
Mission Instructions: Look at the 3 clues. Circle the picture that shows the Big Secret (the Main Idea).
Case #01
The Kitchen Mystery
Evidence Found:
Hat
Spoon
Stove
The Big Secret is:
Camping
Cooking
Case #02
The Garden Mystery
Evidence Found:
Flower
Dirt
Water
The Big Secret is:
Planting
Snowing
Case #03
The School Mystery
Evidence Found:
Pencil
Book
Bus
The Big Secret is:
School
Beach
Case Reports Worksheet L2 Case Reports: Level 2
Main Idea Detective Agency
Agent Name:
Mission Date:
Mission: Read the short report. Find the Big Secret (Main Idea).
Report #04
The Birthday Clue
There is a big cake on the table. There are colorful balloons in the air. Everyone is singing "Happy Birthday" to Max.
What is the Big Secret?
Max is going to sleep.
Max is having a party.
Max is at the park.
Report #05
The Cold Case
It is very cold outside. White snow is falling from the sky. Tim is wearing a heavy coat and warm mittens.
What is the Big Secret?
It is a hot summer day.
Tim is buying a new dog.
It is a snowy winter day.
Report #06
The Vet Mystery
The doctor checked the dog's ears. She gave the cat a shot. The doctor helps all the sick animals feel better.
What is the Big Secret?
A vet takes care of animals.
The dog wants to eat.
Doctors only help people.
Verified Evidence
Evidence Locker Worksheet L3 Evidence Locker: Level 3
Main Idea Detective Agency
Agent Name:
Mission Date:
Mission: Read the report. Write the Big Secret (Main Idea) and one Clue (Detail).
Case #07
The Space Mission
The astronaut climbed into the rocket. He put on his heavy white helmet. Soon, the rocket blasted off into outer space to visit the moon.
The Big Secret (Main Idea):
One Clue (Detail):
Case #08
The Ocean Adventure
A giant blue whale swam through the deep water. Colorful fish played in the coral reef. The ocean is full of many amazing animals.
The Big Secret (Main Idea):
One Clue (Detail):
Case #09
The Pizza Shop
The baker tossed the dough in the air. He added red sauce and lots of cheese. Then he put the pizza in the hot oven to bake.
The Big Secret (Main Idea):
One Clue (Detail):
Secret Word Bank
Making pizza Astronaut going to space Ocean animals Helmet Whale Cheese
Case File Teacher Guide Teacher Resource
The Detective's Manual
Lesson: Cracking the Case (Main Idea)
Authorization
Mission Objective
Students will define Main Idea as the "Big Secret" of a text and Supporting Details as the "Clues" that lead us to that secret. By the end of this mission, students will identify the main idea across visual and text-based formats.
Pacing Guide
10 min Case Brief Presentation
20 min Tiered Fieldwork (Worksheets)
10 min Evidence Debrief & Exit Ticket
The Script: Introducing the Concept
1
Hook the Class:
"Detectives, we have a mystery to solve today. Every story has a Big Secret. We call this the Main Idea. But a good detective doesn't just guess—they look for Clues! These are our Supporting Details."
2
Model the Thinking:
"Look at my desk. I have a pencil, a notebook, and a ruler. If these are my clues, what is my Big Secret? (Pause for answers). Right! My secret is that I am getting ready for school!"
Mission Support (Differentiation)
Level 1
Visual Agents
Focus on categorization . Use the Clue Matching worksheet. Provide physical objects (manipulatives) if needed to represent the clues.
Level 2
Reading Agents
Focus on multiple choice . Read the reports aloud. Encourage students to underline the words that helped them choose their answer.
Level 3
Writing Agents
Focus on evidence extraction . Use the Evidence Locker worksheet. Students should use the word bank if spelling or recall is a barrier.
Pro-Tip for SpEd
Use a physical magnifying glass! Hand them to students while they work on their "fieldwork." It increases engagement and provides a tactile reminder of their role as an active reader/detective.
Red Herring Slides Warning: Distractors
RED HERRINGS
Spotting the Clues That Don't Belong
The Red Herring
The Wrong Clue
A Red Herring is a detail that does not support the Main Idea.
It tries to trick you!
Spot the Herring
Big Secret: We are going to the Beach!
Sunscreen A Clue!
Snowman Red Herring!
Towel A Clue!
Report Analysis
"The fire truck has loud sirens. It is painted bright red. The grass is green. The fire truck helps put out fires."
Big Secret:
Fire trucks are important.
Red Herring:
The grass is green.
Stay Sharp, Agents!
Don't let the Red Herrings trick you in your next mission. Look for the clues that prove the Big Secret!
