Terry Pratchett’s. MORT.  

As a teenager, Mort has a personality and temperament that makes him unsuited to the family farming business. Mort's father Lezek takes him to a local hiring fair in the hope that Mort will land an apprenticeship; not only would this provide a job for his son, but it would also make his son's propensity for thinking someone else's problem. Just before the last stroke of midnight, Death arrives and takes Mort on as an apprentice (though his father thinks he has been apprenticed to an undertaker). Death takes Mort to his domain, where he meets Death's elderly manservant Albert, and his adopted daughter Ysabell. Mort later accompanies Death as he travels to collect the soul of the King of Sto Lat, who is due to be assassinated by the scheming Duke of Sto Helit. After Mort unsuccessfully tries to prevent the assassination, Death warns him that all deaths are predetermined, and that he cannot interfere with fate.