A Simple Favour: Blake Lively is hiding a dark secret from Anna Kendrick in first trailer

Blake Lively wiped clean her Instagram account, including her profile picture, as a publicity stunt for her upcoming movie titled A Simple Favour. A trailer for the same released on Wednesday and now we know why the Instagram account had to be so mysterious.

A Simple Favour is a story of Stephanie, played by Anna Kendrick, and her best friend Emily, played by Blake Lively.

Stephanie is a vlogger who is also a mother. In her small town, she has a best friend called Emily who lives with her husband Sean, played by Henry Golding. Seemingly perfect Emily has a deep dark secret and one day she just disappears from Stephanie's life.

Now it's up to Stephanie and Sean to figure out 'what happened to Emily?' -- the very question has been posted on Blake Lively's Instagram bio.

Watch the trailer

This stylish thriller is directed by Paul Feig. Apart from Lively, Kendrick, and Golding, the movie also stars Andrew Rannells, Linda Cardellini, Jean Smart, and Rupert Friend.

A Simple Favour is set to release on September 14.