Since I haven't had the chance to read 'hook line and sinker a novel', I can only make some general speculations. It could be centered around a mystery, with the characters trying to unravel some sort of enigma. Or perhaps it's a coming - of - age story, where the protagonist learns important life lessons. It might also explore social or cultural issues, showing different perspectives through the eyes of its characters.
By creating mystery. For instance, if the first line is something like 'The first line of a war story was a whisper in the dark.', it makes the reader wonder what that whisper was about and who was whispering.
Look at the manga," Horizontal Line ". This manga did not have an official physical book version. At present, the comic was mainly distributed through the digital comic version of the Kuaikan comic platform. However, the comic may also be published separately in some areas. The specific publishing situation needs to be referred to the local cultural publishing department.