Mo. Rev. Stat. § 521.630
Current with changes from the 2024 Legislative Session
When any such petition shall be exhibited, the plaintiff, being served with a copy and notice as aforesaid, shall appear and answer the same; and on his failure to do so, the petition shall be taken to be true, and judgment rendered accordingly.
§ 521.630, RSMo
RSMo 1939 § 1501