Partners in crime (Phantom Thief AU

This is a Saiouma fanfic about the famous Au, Phantom thief, but of course there's a catch....

Shuichi Saihara, the Ultimate detective, has been working on the Phantom thief case for about 3 months, and he never seemed to even lay a finger on the thief despite his 3 months of chase. He then got an idea after hearing a rumor that some of the famous thieves of Japan were gonna meet up and plan the biggest heist in human history.

To prevent this from happening he disguised himself as a thief and with the help of the police he started to become famous with the objective of catch all of the thieves before the heist happens.