Landscape contractor Roger Cook helps homeowner Molly Simmons turn her neglected slate walkway into an attractive and safe footpath. Back in the loft, Roger, plumbing and heating expert Richard Trethewey, general contractor Tom Silva, and host Kevin ... (more)O'Connor try to guess "What is it?" Then Richard helps homeowner Mark Harney diagnose and repair a frustrating leak in a fiberglass shower stall.