Sherlock’s fourth season was a whirlwind of twists, turns and excitement. While this season was extremely entertaining and watchable, many of the emotional stakes felt forced and it lacked Sherlock’s addictive spirit that made previous seasons so great. SPOILER ALERT THE NEXT TWO PARAGRAPHS. Throughout this season Sherlock takes a more personal look at the characters as their pasts catch up with them and they are forced to finally face their demons. Mary’s mysterious former life comes to light as an old teammate surfaces to kill her after thinking that she betrayed their team, and while she escapes his threat, she ultimately dies saving Sherlock after he’s provoked the woman who betrayed Mary with his cockiness.