A look into Grisha's memories shows Eren the many secrets his father was hiding, including one which led to his mother's demise.
Quiet. The walls here are thin.
.اصمت. الجدران هنا رقيقة
Sei still! Die Wände hier sind dünn!
Tais-toi ! Les murs ont des oreilles !
Zitto, questo edificio ha le pareti sottili!
Хватит! Тут даже у стен есть уши!