surprising turn of events

Translations
неожиданный поворот событий
The story took a surprising turn of events when the hero revealed his true identity.
История приняла неожиданный поворот событий, когда герой раскрыл свою истинную личность.
Definitions
An unexpected change in a situation or outcome that deviates from what was anticipated or planned.
Words
event

noun
событие
turn

noun
поворот
surprising

gerund / present participle
удивительный