HBO has release the plot descriptions for the fourth and fifth episodes of Game of Thrones: Season 6 in all their vague glory.

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The synopsis for episode 4, "Book of the Stranger," reads: "Tyrion (Peter Dinklage) strikes a deal. Jorah (Iain Glen) and Daario (Michiel Huisman) undertake a difficult task. Jaime (Nikolaj Coster-Waldau) and Cersei (Lena Headey) try to improve their situation."The synopsis for episode 5, "The Door," reads: "Tyrion seeks a strange ally. Bran (Isaac Hempstead Wright) learns a great deal. Brienne (Gwendoline Christie) goes on a mission. Arya (Maisie Williams) is given a chance to prove herself."As Game of Thrones goes further and further into unknown territory, HBO's descriptions for each episode get more and more cryptic. Tyrion's storyline, for instance, is certainly up for speculation. Who is his "strange ally"? Some of the other tidbits of information are a bit more straightforward.It's interesting to note that HBO has left out a certain character entirely from these descriptions who likely will have a huge role to play in the episodes to come. It's good that the network is respecting its own big spoiler, but if you're falling behind on this season (or waiting to binge it later), it's only going to get harder and harder to avoid those big reveals taking over pop culture.Game of Thrones airs Sundays at 9 p.m. ET/PT on HBO. Check out IGN's latest "Dragons on the Wall" episode for our thoughts on episode 2, "Home," and -- if you're itching for more details on what's ahead than what HBO is providing -- Maisie Williams recently revealed a familiar character we'll be seeing again soon

Terri Schwartz is Entertainment Editor at IGN. Talk to her on Twitter at @Terri_Schwartz