How's the Pain by Pascal Garnier

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Death is Simon's business. Now the aging vermin exterminator is preparing to die. But he still has one last job down on the coast and he needs a driver. Bernard is twenty-one. He can drive and he's never seen the sea. As the unlikely pair set off on their journey, Bernard soon discovers Simon's definition of vermin is broader than he'd expected . . .
This offbeat story is an affecting study of human frailty.