Mirage - Tapa dura

Dedicated young Julie Gordon has no time for anything except her work. A leading research scientist at just twenty-eight, Julie has created the most exciting virtual reality program ever: a computer-enhanced, 3-D voyage into a subject's mind, where memories become a surreal landscape of people, places, and events from the past. The memoryscape is a disturbing, exciting place, where the erotic mixes with the innocent, the mysterious with the mundane.
The program is still highly experimental when Julie receives the shocking news that her estranged twin sister, Samantha, is in a coma. No one, not even the best doctors, can determine the cause of her condition. Nonetheless, Samantha is losing brain function, dying little by little. The only hope is for Julie to delve into the fractured maze of Samantha's mind with her experimental program.
Deep in the devastated memoryscape of her sister's brain, Julie comes to understand her twin better in near-death than she ever did in life. The exploration becomes a voyage of self-discovery that leads her to the staggering realization that someone has tried to kill her sister. Now Julie must find out who, how, and why before all the precious information is irretrievably lost and Samantha's mind is destroyed forever. Even when - at the heart of Sam's memoryscape - she learns that she herself is in danger, and that the nightmare has only begun....