The spirit of murdered British aid worker David Haines is to live on an uplifting children 's tale written by two French journalists held captive alongside him by Islamic State . Nicolas Hénin and Pierre Torres are publishing Papa Hérisson Rentrera-t-il à la Maison ? – 'Will Daddy Hedgehog Ever Come Home ? ' , on March 11 . The pair , aged 39 and 30 , were kidnapped in Raqqa , Syria in June 2013 and released 10 months later . David Haines and Jihadi John , since unmasked as Muhammed Emwazi , in the video of his beheading produced by ISIS ( left ) . An idea of the British aid worker 's was the inspiration behind the children 's book Hérisson Rentrera-t-il à la Maison ? – 'Will Daddy Hedgehog Ever Come Home ? ' ( right ) They spent time in captivity with Mr Haines , 44 , a former RAF aircraft engineer who was kidnapped in March 2013 while working for an aid agency in Syria . The book 's writer Mr Hénin - who has a four-year-old daughter and a one-year-old son - and illustrator Mr Torres , have now paid tribute to Mr Haines as the inspiration behind the sweet tale . It tells the tale of a father hedgehog who is carried off in a picnic basket by humans after falling into a picnic basket while foraging for food for his family . A little boy holds him captive in a box in the garden shed , saying : 'You 'll be my favourite animal . I 'll teach you tricks and you 'll do anything I want . ' The hedgehog manages to escape and heads off on a series of adventures with a cast of helpful animals , including a rat , a cat and an eagle , before finally returning home . Mr Hénin , whose five-year old daughter is almost exactly the same age as Mr Haines 's youngest , Athea , told the Daily Telegraph : 'The idea was to create poetry from the obscene . 'We had dreamed together about our life after the ordeal and the meeting of our two daughters . French journalists Nicholas Hénin ( left ) and Pierre Torres ( right ) spent time with Mr Haines as ISIS captives . 'Even if he did n't write this book , his spirit is in this work . His spark is there . ' Though Mr Hénin and Mr Torres both made it back to their families - the French government has denied paying a £12 million ransom for their release - Mr Haines did not as he was savagely beheaded . British militant Jihadi John , since unmasked as west Londoner Mohammed Emwazi , carried out the horrific murder in September 2014 . Mr Haines ' name does not appear in Mr Hénin and Mr Torres ' book - written on scraps of paper and card they managed to hide from their captors - but the idea for it came from a game of turning people into animals which started with the former RAF aircraft engineer . Mr Haines with his daughter Athea . Mr Hénin has a five-year old daughter almost exactly the same age . The Frenchmen chose the prickly hedgehog for their book because they are known for finding their way home even if displaced . At one point the main character spots a squashed colleague on the road he is desperately trying to cross - the only one allusion to the death of a fellow hostage . As well as Mr Haines the French pair spent time in captivity with freelance journalist John Cantlie , American journalists James Foley and Steven Sotloff and aid workers Peter Kassig and Brit Alan Henning . Mr Cantlie is still being held . Apart from him all but Mr Hénin and Mr Torres were murdered by their jihadi captors . Mr Torres paid tribute to Mr Haines as a 'great judge of character ' who was expert at sorting out disputes between cellmates .
Frenchmen Nicolas Hénin and Pierre Torres were in captivity with Haines . Pair have written and illustrated Hérisson Rentrera-t-il à la Maison ? Book came from an idea of Haines ' while they were all being held by ISIS . Tells story of captive hedgehog who escapes and finds his way home . Hénin , 39 , and Torres , 30 , were released after 44 in Syrian prison . Father-of-two Haines , 10 months , was beheaded by Jihadi John in September .