Sentries of the Sunnah: Mystery in the Masjid - Book 4 By Umm An-Nu'man

When Sa'eed, a Sentry of the Sunnah, thinks he sees a man disappear behind a secret door in the musalla, the Sentries of the Sunnah can't decide if they should try to find the secret door or let it remain a secret. When Muhammad, one of the Sentries of the Sunnah, decides he wants to be the one to discover the door and what lies behind it, he disobeys his parents and ends up disappearing! Can the Sentries of the Sunnah discover what happened to Muhammad or will his disappearance be a mystery no one can solve?