If Friendster went HAL, you'd get Liza, the computing giga-brain behind Eden Inc., a matchmaking service so accurate that clients think its $25,000 fee a pittance. It's a brainstorm impeccably in tune with the times, making the too-obvious mystery Child grafts on top of it that much more disappointing. Two of Eden's perfectly matched ''supercouples'' appear to commit double suicide, which confounds the former FBI psychologist (with a past!) hired by Eden to investigate. Given Eden's fascist security measures and Orwellian reach into its clients' lives, maaaybe the hero should just, you know, read more sci-fi.