Landscape contractor Roger Cook travels to the California desert to repair the drip irrigation system of homeowner Sherry Steele. With the help of specialist Bob Galbreath, they fix the system and restore water to the plants surrounding her home just outside Los Angeles. Back in the loft, Roger, plumbing and heating expert Richard Trethewey, general contractor Tom Silva, and host Kevin O'Connor try to guess "What is it?" Then Richard and tile expert Joe Ferrante help Melrose, Massachusetts, homeowner Bobby DiFraia repair his leaky bathtub once and for all.