Paprika

Widely acknowledged as Yasutaka Tsutsui's masterpiece, Paprika unites his
surreal, quirky imagination with a mind-bending narrative about a psychiatric
institute that has developed the technology to invade people's dreams.
When prototype models of a dream-invading device go missing at the Institute for
Psychiatric Research, it transpires that someone is using them to drive people insane.
Threatened both personally and professionally, brilliant psychotherapist Atsuko Chiba has
to journey into the world of fantasy to fight her mysterious opponents. As she delves ever
deeper into the imagination, the borderline between dream and reality becomes
increasingly blurred, and nightmares begin to leak into the everyday realm. The scene is
set for a final showdown between the dream detective and her enemies, with the
subconscious as their battleground, and the future of the waking world at stake.
With a new, authorised English translation  this is a brilliant addition to the SF Masterworks collection.