"L change the world" novel is an alternative ending to Death Note: L wrote his own name in the Death Note trying to avoid Light to make this step first. L knew that Light won't mention the cause of death nor will pick a specific time for his death, so eventually the detective will die from a heart attack in 40 seconds. Thus L has only 23 days to live and 22 days to save the world, stopping a bioterrorism group that's ready to wipe out... well, most of humanity.

At the beginning of the story L is the same cold detective who never allows emotions interfere with his sense of justice but lately it is revealed that he deeply cares about the whole mankind and he eventually gets involved in some sort of brother-and-sister-relationship with a little girl.

There are more details about L's past and personality and you can find out why his back was chronically curved, why he had indelible black circles around his eyes and the reason he likes sweets. That scene was very emotional and well written; it made me love this character even more.
The sad ending broght me to tears (despite the fact that's something I was constantly aware from the beginning of the novel/ synopsis) and I think it's one of the best written scenes in this book. I also enjoyed the scene when L dials to US president, when the president could hear L's real voice for the first time. L's voice description is simply beautiful and touching.

The novel was meant to show L's more human side, to pull him out of the box of 'robotic reclusive detective' and I think it succed in showing another side of L's personality. You'll be impressed by his emotions and the pain he went through...

I really enjoyed L's tricks... you can trust him to be at least one step ahead of everyone else. His interaction with the other characters is pretty interesting and funny. You will notice a bit of characters development for the supporting cast as well.

There are some hard to believe scenes and sometimes the dialog is a bit clishe. It made the author seem kinda amateurish. It's hard to belive it's supposed to be written by the same Mellow as "Deat Note: Another Note-LA BB Murder Case" but the plot is enjoyable and fun to read. There's always something entertaining to find out and there are also some turnaround scenes that you'll find interesting. The paicing is fast enough not to make you feel borred and it's well balanced with the main's character thoughts.

Overall, the book was a fun read. "L change the world" isn't any masterful piece of writing but ignoring that, I'd really recommend this book for a better undestanding of L's complex personality. I read this novel especially for L, as a kind of biography and not for the plot itself so I think it worth the time. I would recommend this book to major L fans like myself. I wouldn't recommend this however to people who have not seen Death Note or have not read the comics.

P. S. "L change the world" is a novel adaptation of the live action film, L: Change the WorLd. I didn't watched the movie but everyone said the novel is way better. [Personally, I would not even try to see the movie because I already have the anime version of L in my mind and I do not want to ruin that image... ]