Mo. Rev. Stat. § 429.270
Any and all liens in sections 429.010 to 429.340 provided for may be adjudicated and determined and the rights of all parties interested in the same and in the property and of any of the property against which the same is claimed may be adjudicated, determined and enforced in one action which may be brought by any such lien claimant after the statement for such lien is filed in the office of the clerk of court, as herein provided, or such action may be brought by any owner or lessee of the property or any of it to be affected, or mortgagee or holder of any other encumbrance thereon. Such action shall be an equitable action for the purpose of determining the various rights, interest and liens of the various mechanics' lien claimants and claimants of other liens and owner of any interest in or leasehold upon said property and for enforcing the rights of any and all such persons in, to or against the property, being the lands and buildings and either of the same and for sale of such property, land and buildings or either of the same and for marshalling and distribution of the proceeds thereof among the parties according to their respective legal and equitable rights therein. Such action shall be an equitable action for the purpose of determining, establishing and enforcing the various and respective rights of the parties thereto and for the purpose of marshaling, applying and distributing the proceeds of the sale of such property that may be ordered and decreed in said action.
§ 429.270, RSMo