Dic: twist (as an unexpected change)

unexpected change. 2 [countable] △an unexpected change or development in a story or situation.

• the twists and turns of his political career. 
• The story has taken another twist.
• The disappearance of a vital witness added a new twist to the case.
• By a curious twist of fate we met again only a week or so later.
• a bizarre twist to the tale.

8. N-COUNT △A twist in something is an unexpected and significant development.

• The battle of the sexes also took a new twist.

10. PHRASE : twist inflects, usu by/in PHR △If something happens by a twist of fate, it happens by chance, and it is strange, interesting, or unfortunate in some way.

• By a curious twist of fate, cricket was also my favourite sport.

.... OALD, Cobuild