# XIII: The Unbreakable Alibi explained — Partners in Crime

> Chapter companion for Partners in Crime by Agatha Christie.

## What happens

Tommy and Tuppence take on the case of Mr. Montgomery Jones, who is in love with Una Drake but is troubled by a wager she made with him. Una bet that she could be in two places at once, and Montgomery Jones wants the detectives to uncover the truth. Tuppence deduces that Una has a twin sister, Vera, who arrived from Australia, allowing Una to appear in both London and Torquay simultaneously. The case is solved, and the couple celebrates their success.

## Themes in this chapter

### Deception and Trust

The entire case revolves around a deceptive alibi, and the trust between Montgomery Jones and Una Drake is tested.

### Humor and Irony

The playful banter between Tommy and Tuppence, and the absurdity of the twin solution, add a lighthearted tone.

### Marriage and Partnership

The case highlights the dynamics of Tommy and Tuppence's partnership, and the potential marriage of Montgomery Jones and Una Drake.

## Character check-ins

### Tommy Beresford

Works as Mr. Blunt at the detective agency, handles the client interview and investigation.

### Tuppence Beresford

Acts as confidential secretary, solves the mystery by deducing the twin sister solution.

### Montgomery Jones

New client who seeks help with a wager involving Una Drake's alibi.

### Albert

Office boy who announces Mr. Montgomery Jones.

### Una Drake

The subject of the investigation; her twin sister is the key to the alibi.

## Key lines

> I have done it, Tommy. I have solved the mystery of the alibi.

Tuppence announces she has cracked the case.

_Tuppence reveals her successful deduction._

> A perfectly simple one,” said Tuppence. “ Twins. ”

The solution is that Una has a twin sister.

_The key to the unbreakable alibi._

> It is not a really satisfactory solution,” said Tuppence. “Not the ingenious sort of flaw that Inspector French would have detected.”

Tuppence feels the solution is too simple compared to fictional detectives.

_A humorous nod to detective fiction._

## Links

- HTML: https://www.betterreads.online/discover/partners_in_crime_se/chapters/xiii-the-unbreakable-alibi
- Book: https://www.betterreads.online/discover/partners_in_crime_se
- All chapters: https://www.betterreads.online/discover/partners_in_crime_se/chapters