Can everyone's favourite insurance mathematician, Henri, combine the increasingly dangerous world of adventure parks with the unpredictability of blended-family life? He's about to find out in the final instalment of the hilarious, nail-biting Rabbit Factor Trilogy.

'A joyous, triumphant conclusion to Tuomainen's trilogy ... the comic thriller of the year' Sunday Times THRILLER OF THE YEAR

'Quirky crime capers don't come more left field than the Rabbit trilogy ... extremely funny, with a wicked line in social satire' Daily Mail

'One of those rare writers who manages to deftly balance intrigue, noir and a deliciously ironic sense of humour' Vaseem Khan

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Henri Koskinen, intrepid insurance mathematician and adventure-park entrepreneur, firmly believes in the power of common sense and order. That is until he moves in with painter Laura Helanto and her daughter...

As Henri realises he has inadvertently become part of a group of local dads, a competing adventure park is seeking to expand their operations, not always sticking to the law in the process...

Is it possible to combine the increasingly dangerous world of the adventure-park business with the unpredictability of life in a blended family? At first glance, the two appear to have only one thing in common: neither deals particularly well with a mounting body count.

In order to solve this seemingly impossible conundrum, Henri is forced to step far beyond the mathematical precision of his comfort zone ... and the stakes have never been higher...

Warmly funny, quirky, touching, and a nail-biting triumph of a thriller, The Beaver Theory is the final instalment in the award-winning Rabbit Factor Trilogy, as Henri encounters the biggest challenge of his career, with hair-raising results...

Soon to be a major motion picture starring Steve Carell

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Praise for the Rabbit Factor Trilogy:

'Finland's greatest export' M.J. Arlidge

'The funniest writer in Europe' The Times

'Thrilling and warmly human. In these uncertain times, what better hero than an actuary?' Chris Brookmyre

'Delightfully funny' Guardian

'Unlike anything else out there' The Times

'A thrilling and hilarious read' Liz Nugent

'Charming, funny and clever, this is a novel to cheer up anyone who is finding life a little tough' Literary Review

'A delight from start to finish' Big Issue

'Original and brilliant story-telling' Helen FitzGerald

'A coruscating comedy' Sunday Times

'You don't expect to laugh when you're reading about terrible crimes, but that's what you'll do when you pick up one of Tuomainen's decidedly quirky thrillers' New York Times

'A refreshing change from the decidedly gloomier crime fiction for which Scandinavia is known' Publishers Weekly

Right up there with the best' Times Literary Supplement

'A thriller with black comedy worth of Nabokov' Telegraph