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

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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