made The New York Times Best Seller list, alongside Animal Man: The Hunt, Batman & Robin: Born to Kill, Batman: Detective Comics, Wonder Woman: Blood, Batwoman: Hydrology, Green Lantern: Sinestro. Additionally, Barbara Gordon makes an appearance in Birds of Prey #1, where Black Canary offers her a spot on the new Birds of Prey roster. She declines Canary's invitation, suggesting that Katana take her place instead. Series writer Duane Swierczynski has stated that Batgirl will join the team in issue #4. He commented that while she "is an essential part of this team", she is not the focus of the series, as she is hesitant to be associated with the other characters because of their status as outlaws. In October 2014, the monthly Batgirl title underwent a soft reboot with the new creative team Brenden Fletcher (writer) Cameron Stewart (writer, layouts), Babs Tarr (artist) and Maris Wicks (colors). The first six-issue story explored Barbara Gordon's attempt to start a new life as a PhD student in the hip Gotham borough of Burnside. While seemingly light and engaging compared to Gail Simone's darker preceding run, the new arc ultimately dealt with Babs' inability to fully escape her earlier trauma and the villain was revealed as her own brain scans, an algorithm similar to the pre-New 52 Oracle. While the reboot was highly praised for its innovative use of social media, its fun and energy, and particularly for Tarr's art, several critics condemned the villain Dagger Type in issue #37 as a transphobic caricature. In response, the creative team issued a joint apology and revised the issue for the subsequent collected edition, Batgirl Vol. 1: The Batgirl of Burnside. On March 13, 2015, DC Comics released 25 Joker-themed variant covers for its various monthly series for release that June, in celebration of the character's 75th anniversary. Among them was a cover to Batgirl #41 by artist Rafael Albuquerque that took its inspiration from The Killing Joke. The cover depicts the Joker standing next to a tearful Batgirl, who has a red smile painted across her mouth. The Joker has one hand holding a revolver draped over Batgirl's shoulder and is pointing to her cheek with the other hand as if gesturing to shoot her. The cover quickly drew criticism for highlighting a dark period in the character's history, especially when juxtaposed with the youthful, more optimistic direction of the series at the