Based on the provided story, let's evaluate its Tragedy Degree and Comedy Degree.

### Tragedy Degree
- **Tragedy Elements**: The story involves some minor tragic elements, like the author's mysterious disappearance and Tom's initial state of stress and fatigue due to his grueling exams.
- **Emotional Setbacks**: While there are some elements that invoke curiosity and mild sadness, there is no profound tragedy or strong emotional impact.
- **Degree**: The elements of tragedy are present but are not very strong or deep. Thus, the tragedy degree is moderate.

### Comedy Degree
- **Comedic Elements**: The presence of Vitamin the cat provides some light-hearted moments. Mrs. Hargrave is a warm and welcoming character. The story has a somewhat feel-good ending as Tom finds a new sense of purpose.
- **Happy Elements**: Despite the mystery, the story ends on a hopeful note, but it's not an extremely happy or comedic ending.
- **Degree**: There are light-hearted, pleasant elements but not strong comedic aspects. The comedy degree is moderate.

Thus, the scores would be:

```json
{
  "TragedyDegree": 4,
  "ComedyDegree": 5
}
```

These scores reflect the moderate presence of both tragic and comedic elements in the story.
