Batman: Urban Legends, book 1
Chip Zdarsky, Matthew Rosenberg et Collectif2021

Following the events of The Joker War, Gotham City is home to more iconic heroes and villains than ever.
Red Hood has returned to Gotham City, but has been pushed to the edge by his investigation of a new drug called Cheerdrops that has taken the city by storm and has brought up ugly memories of his youth. Batman will have to stop Red Hood from making violent mistakes he won't be able to take back.

Return to Cole Cash (Grifter) to tell a tale that find the legendary antihero running personal security for Lucius Fox but secretly working for the mysterious HALO Corporation...and running afoul of every hero Gotham City has!
(Collects Batman: Urban Legends #1-6)