His name is Shinichi Kudo(u) and still goes to school.
One day, after a date with Ran Mori he is witness to a deal by black-coated men and some boss of a company.
One black-coated guy named Vodka notices him and knocks Shinichi down.
Vodka gives him a new developed poison which kills without a trace.
But Shinichi doesn't die and somehow he got turned back into a child !!!
To take cover , he hides at Ran Moris place, whose father Kogoro is also a detective.
Ran doesn't know that it's Shinichi,
since he calls himself Conan Edogawa.
Since then, he puts Kogoro into sleep with his tranq-watch and imitates his voice to solve cases.