Bungo stray dogs

"When the Agency and the Port Mafia receive a visit from an old mutual friend, they learn where Dostoyevsky's clandestine base is hidden. Two sworn enemies--Atsushi and Akutagawa--must now bite the bullet and infiltrate the site together under Dazai's orders, but will this forced teamwork give birth to an invincible duo...or will it stir hatred once more?"--Back of cover.