Taiwan has charged a retired air force captain and his son with handing intelligence officers' personal data to China — another sign that Beijing's spy network inside Taiwan reaches into the military's own former ranks.

• A retired air force captain is accused of collecting the personal details and movements of two Taiwanese intelligence officers and passing them to China.
• He pulled his son into the scheme, using the son's job as a real estate agent to look up property records tied to those officers.
• After retiring from the military he served as a township chief in China's Hebei province, pointing to years of close ties with the mainland.
• A court in Taoyuan ordered him held for three months with no visitors or mail, citing flight risk and the chance he would tamper with evidence or coordinate stories with witnesses.
• He deleted his contacts and chat logs with accomplices before investigators reached him, and denies the charges.

Outlook: The case heads to trial on charges carrying a minimum of ten years in prison, and more prosecutions of retired Taiwanese officers are likely as Taipei keeps pressing its crackdown on Chinese espionage.