Is espionage immoral? The discovery of a Chinese spy at the very heart of British politics is causing consternationA feeling of shock or confusion. It derives from a Latin verb meaning to alarm or dismay.. But some say it is the price we must pay for global security.
Britain poised to unmask Chinese spy network

Glossary
Consternation - A feeling of shock or confusion. It derives from a Latin verb meaning to alarm or dismay.
Palace of Westminster - Where the UK's House of Commons and House of Lords meet.
Infiltrated - When someone has secretly become part of a group to gain information about it.
Parliamentary aide - Assistants to officials and politicians in parliament.
Sun Tzu - A Chinese military general and philosopher who lived in the Eastern Zhou period.
Espionage - Spying.
CIA - The Central Intelligence Agency is a US government organisation that collects secret information about other countries.
Informants - A person who gives information.