'Who Killed Lucy Beale?' is the question that has kept EastEnders fans guessing since April last year, but we're now just four weeks away from discovering the identity of the unknown culprit.
Over the past nine months, there's been an endless collection of clues, hints and red herrings to keep the speculation brewing - and even the most ardent fan may have struggled to keep track of them all.
To help out as the storyline nears its long-awaited conclusion, Digital Spy has put together a video case file which rounds up what we think are the most important clues in this compelling mystery.
Hit play above to watch us make our way through the suspects and some possible theories - then feel free to share your thoughts on who killed Lucy in the comments box at the bottom of the page.
EastEnders will reveal Lucy's killer on Thursday, February 19 as the show celebrates its 30th anniversary.
