California tutor Alice Coo vanished during a trip to Taiwan in 2019, sparking a two-continent search that exposed her secret marriage to a Silicon Valley engineer and uncovered damning digital evidence of foul play. Her family's determination led to a civil verdict against her husband, though her body remains undiscovered in the country's treacherous Taroko National Park. Alice Coo's family discovered she had secretly married Dr. Harold Hirchen, a 60-year-old Stanford PhD engineer with two previous marriages, despite being close-knit and regularly communicating. Email metadata proved Harold sent a message from Alice's account to himself while claiming she had traveled alone to visit her parents, establishing he retained her phone after she disappeared.