Killing Mr. Griffin is a book by Lois Duncan. It was published by Little Brown. Mr. Griffin is a tough English teacher: he won’t accept anything late, even from class president Dave Rutters; he won’t succumb to Betsy Cline’s cuteness when she doesn’t understand the assignment; he even made Mark Kinney beg for a second chance in his class. When Mark’s buddy Jeff makes an off-hand comment about wanting to kill Mr. Griffin, he begins to plot an elaborate plan to scare him to death. They invite sweet, straight-A earning junior Sue McConnell to hang out with them. As she has a huge crush on Dave, she’s all about it. They include her in on the plan to scare Griffin by asking her to request a meeting with him. After the meeting, they plan to kidnap him and scare him a bit.
The morning before Sue’s meeting, we meet Brian Griffin at home with his pregnant wife Kathy. She talks to him about being too hard on his students, especially the good ones like Sue. She panics before he leaves, like a horrible feeling it’ll be the last time she sees him.
So, the plan happens. Sue bails out after the meeting because when Griffin gets grabbed, he yells “Run!” to her to protect her. The others (Jeff, Betsy, Mark, and Dave) take him to a special place that Mark and his ex Lana found with a waterfall and such. They find his prescription for his angina, and Mark stomps on the pills. Then they decide since he won’t beg for mercy, they’ll leave him for the night. Dave goes by Sue’s house later that evening, and she asks to go untie Griffin. Sadly, as you’d've already guessed, he died because of his heart condition.
So, they spend the rest of the book hiding his death. They bury Griffin, they feed lies to the police, but Kathy’s pretty smart and knows that Sue is BSing them big time. Later, Lana went on a hike with her new boyfriend and she found the prescription bottle. The police figure out where he is. Dave took Griffin’s college ring because it reminded him of his father, and his grandma took it from him. So there’s another liability. They also paint Griffin’s car.
Betsy, Jeff, and Mark need alibis so they can drop off Griffin’s car on the nearby reservation. Betsy says she’s at Sue’s while Jeff says he’s at Dave’s. Well, when they call Dave, it doesn’t fly because they’re having a wake for his grandma who died that morning. A neighbor said gma was talking to a boy in a brown sweater right before it happened. Sue realizes Mark killed gma because he always wears brown. Mark sends the other two out to wait for him, and he ties up Sue and starts cooking the curtains. Luckily for Sue, Kathy and Police Detective Baca were coming over to question her, and they arrest the right people and she gets to live.
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