Betty and Megan as Sisters
The A.B.C. MurdersThis thread traces Megan’s complicated devotion to Betty, from candid criticism through grief to the preservation of her sister’s real character.
increasing
Bearing strength in each event
decreasing
Different Sisters

Contrast Without Estrangement
Betty’s social ease
Betty is pretty, playful, and drawn to compliments. Megan is more intense and self-contained, often judging her sister’s choices.
Affection beneath criticism
Megan’s bluntness does not mean indifference. She believes Betty is heading toward trouble and tries to make her understand the consequences.
Advice Not Taken

A Sister Tries to Intervene
Warning about Donald
Megan sees that Betty’s lies and flirtations are damaging her relationship with Donald. She urges her sister to change course.
A familiar refusal
Betty believes she has done no real harm and continues to enjoy her freedom. Their disagreement remains affectionate but unresolved.
The Murdered Sister

Shock and Disclosure
Public grief
Megan returns to the family home and faces the news that Betty is dead. She initially tells Hastings a deliberately false, idealized account.
Trust earned
Poirot explains that the killer’s letters point to a stranger. Megan then reveals the truth about Betty’s life and Donald’s jealousy.
The Unsent Gift

A Small Grief
Their mother’s stockings
Megan remembers Mrs Barnard crying over stockings bought for Betty on the day she died. The ordinary gift makes the absence painfully immediate.
Sympathy shared
Franklin Clarke understands the force of such details, and Megan responds with warmth. The exchange deepens a bond that will later prove dangerous.
Living With the Truth

Love Without Idealization
Betty restored
Megan’s account has helped prevent her sister from becoming a false, perfect symbol. She preserves Betty’s charm and foolishness together.
A future not erased
Megan continues living after her sister’s death and may build a relationship with Donald. Her love for Betty does not require remaining frozen in mourning.
Before July 1935
About one month before the murder
July 25, 1935
After the murder, during the Legion meeting
After the culprit is exposed