Mo. Rev. Stat. § 358.220: Right to an account.

Any partner shall have the right to a formal account as to partnership affairs:

(1) If he is wrongfully excluded from the partnership business or possession of its property by his copartners;

(2) If the right exists under the terms of any agreement;

(3) As provided by section 358.210;

(4) Whenever other circumstances render it just and reasonable.