But the next call came from a stranger, informing me that grandma had died of carbon monoxide poisoning while sleeping in the car.

I trembled as I dialed Josh's number dozens of times, but no one answered.

The doctor said that grandma not only had excessive carbon monoxide in her system but also traces of sedatives.

I checked the car's dashcam footage and saw Josh buying grandma a drink, coaxing her to take a nap before going to the movies.

The old lady obediently drank the beverage and soon fell asleep.

Meanwhile, Josh eagerly donned the Santa Claus costume, locked the car and rushed off to please his secretary, Tatiana.

He caused grandma's death but still blamed her for leaving without telling anyone.

I scolded him, "Shut up, Josh! How dare you mention grandma? She was so old, how could you leave her alone in the car?"

A hint of impatience flashed across Josh's face, but he suppressed his temper and pleaded, "I'm sorry, I was wrong! Baby, don't be mad, it's all my fault! Tomorrow, I'll kneel in front of grandma and apologize to her, okay?"