Viv's son Sherman lets the bathtub overflow, destroying the plaster on the ceiling below, leaving a large amount of damage to the home. This causes Lucy to ask Viv to pay for the repairs as per her lease.
Mr. Mooney claims that Viv, as the renter, must pay for damages or she'll be evicted. Reading the lease, Viv learns that a clause in the agreement allows her to use her rent payments as a deposit and she could actually buy and take possession over the house and throw Lucy out if she wanted.
Mr. Mooney and Lucy are frantic, and decide that the only solution is to steal Viv's lease before she enacts on the clause. They climb onto the roof at night with a fishing pole to steal the lease from her night coat while she is taking a nap.
Special Notes: According to Lucy, she and Vivian have been living together for almost exactly 5 years. This is probably one of the best Lucy vs. Viv episodes on the series since "Vivian Sues Lucy".