Courtney Case and the Missing A-Man

This is the fourth book in the exciting Courtney Case Mystery Series.

I'd had a hard week at school, so I wasn't ready for the Saturday morning early knock on my door. I pulled the blankets over my head, hoping whoever it was would go away.
A soft paw reached under the blankets and batted at my face.
"Miaow."
"I'm asleep, Maggie," I told my cat.
The batting persisted. So did the knocking.
"Courtney! Are you there?"
It was Mack. He and his twin sister, Liesel, lived over the road from me.
"Courtney!" Mack called again.
I rolled over and looked at the clock. It was 7:49 am. I dragged myself out of bed, pulled on my dressing gown and staggered to the front door.
"What is it, Mack?" I asked, half yawning at the closed front door.
"I've got a case for you." he answered.

Who has stolen Mack's A-Man? Can Courtney and her trusty sidekick Laura solve the case?

Ages 7 to 10
Chapter book
Reading level: 3.0