Tā zài mìmì qíngbào jīgòu de yālì xià, zuìzhōng tóuchéng.
Under pressure from the secret intelligence agency, he finally defected.
Tips
usage
投诚 implies both physically switching sides and pledging sincerity (诚) to the new side. It is typically used in military or political contexts. Compare with 投降 (tóuxiáng), which means simply to surrender without necessarily switching allegiances.
