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Main Idea and Inferencing CSI Reading Mystery – The Missing Answer Key comprehension activity for Grades 3–6
Reading Mystery

Main Idea & Inferencing

Reading Mystery Worksheets · Grades 3–6 · The Case of the Missing Answer Key

Grade 3Grade 4Grade 5Grade 6Grades 3-6Answer keys included

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Inside the case file

Everything is set for the big reading review test — until the answer key suddenly disappears. This printable Main Idea & Inferencing Reading Mystery turns close reading and test-prep skills into a detective investigation for Grades 3–6 classroom teachers, homeschoolers, and tutors. It's built for state-testing season and drops straight into a reading review or comprehension lesson.

With every correct answer another suspect is cleared, so close reading — not guessing — is what solves the case. Print and go.

Quick Details

Grade Levels: Grades 3–6
Format: Printable PDF (36 pages)
Resource Type: Reading Mystery worksheets
Reading Skills: Main idea & supporting details, inference, text evidence, figurative language, character analysis
Tech Needed: None — no apps, locks, passwords, or student logins required

The Case

Everything is ready for the reading review test, but the answer key has vanished — and no one knows who took it. Investigators have rounded up a line-up of suspects, but it's up to your students to uncover the truth. The only way to crack the case is to read closely: every comprehension answer is a clue that rules another suspect out, until just one remains.

How the Reading Mystery Works

Reading Detectives read about how to find the main idea and make inferences, gather evidence from the passage, and eliminate a suspect with each answer until only the culprit stands.

What's Included

  • A mystery introduction page that sets the scene and the mission
  • A suspect line-up page
  • A reading comprehension passage
  • Multiple-choice reading comprehension questions
  • Open-ended reading response questions
  • A vocabulary word list and word search for early finishers
  • Extension activities for deeper thinking
  • A full answer key
  • Print-and-go PDF format

Skills Covered

  • Main idea and supporting details
  • Making inferences
  • Using text evidence
  • Figurative language (simile and metaphor)
  • Analyzing character behavior
  • Critical thinking and problem-solving

Best Used For

  • State testing and standardized test prep
  • Reading comprehension review
  • Reading centers, early finishers, sub plans, and small groups
  • Homeschool reading