The unexpected ways a mentor can shape your career

The trailer for the The Devil Wears Prada sequel has dropped - and viewers immediately noticed a huge change in the dynamic between the two main characters.

In the original film, magazine editor Miranda Priestly famously terrorised her staff, but also served as an unconventional mentor to Anne Hathaway's character. 

In the sequel's trailer, the pair look to be on even footing.

So, who shapes our careers? And how big a difference can a mentor make?