Her Sister’s Killer

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What to expect

Chosen by The Times as one of the best crime fiction books in 2025.

'First-class' Reader review, ⭐⭐⭐⭐⭐
'A breathtaking finish' Reader review, ⭐⭐⭐⭐⭐
'What a rollercoaster' Reader review, ⭐⭐⭐⭐⭐
'Tremendous' Reader review, ⭐⭐⭐⭐⭐
'Wow, wow, wow' Reader review, ⭐⭐⭐⭐⭐
'Absolutely brilliant' Reader review, ⭐⭐⭐⭐⭐

Newly promoted Inspector Frankie Oliver has always been consumed by the idea of finding her sister's killer and bringing them to justice.

But when new evidence about the tragic unsolved murder comes to light, and her former boss DCI David Stone embarks on an investigation without her, everything starts to unravel.

After decades without answers, who knows where the trail might lead? And will knowing the answers be the very thing that breaks Frankie irreparably?

The past and present collide with devastating consequences in this taut, breathless new thriller from award-winning crime writer Mari Hannah.

Read what everyone is saying about Her Sister's Killer:

'Such a great writer' IAN RANKIN

'Reading her books reminds me of why I love reading so much. Incredible characters and inspired plots; the gold standard' GRAHAM BARTLETT

'A rich, complex and thrilling book' KATE LONDON

'A classy thriller packed with pace and action, Hannah also brings real depth and human interest to the story' ANN CLEEVES

'Treat of a crime novel' ROXY BOURDILLON

Critics Review

Mari Hannah, in short, sharp chapters, proves once again her mastery of plot, procedure and police humour. The denouement, when it eventually arrives, is satisfying and shocking
The Times
Already one of Britain's top crime writers, Mari just gets better and better. Her Sister's Killer begins with a fantastic opening - both thrilling and moving and doesn't let up from start to finish. A rich, complex and thrilling book.
Kate London
A classy thriller packed with pace and action, Hannah also brings real depth and human interest to the story.
Ann Cleeves
Such a great writer. Never written a single lazy sentence.
Ian Rankin
Reading her books reminds me of why I love reading so much. Incredible characters and inspired plots; the gold standard.
Graham Bartlett
This was a real page-turner that see-sawed between cases, keeping tension taut till the very last sentence
Alex Gray
Her Sister's Killer had me hooked from the very first line. This treat of a crime novel is engrossing and thrilling, but also deeply moving. Mari has a rare gift for creating pacy page-turners with genuine emotional depth, offering insight into the nuances of human nature, along with all the twists and turns.
Roxy Bourdillon
Northumberland-based Mari Hannah remains one of the foremost crime fiction writers working in the UK today and her latest 'Her Sister's Killer' is packing real heat... Hannah is brilliant at capturing the various factions in the police force as they rub up against each other, and in 'Her Sister's Killer' she gives us not one, but two meaty cases to get stuck in to.
The Crack

User Reviews

Book 5.0
Narration 5.0
5.0
5.0
This series has just gone from strength to strength. A cast of interesting regular characters, with great depth and various intertwining back stories, is linked to 2 major police investigations: one current and one ‘cold case’. They brilliantly connect and overlap. Highly recommended.
jaspersdad 27/04/2025

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