The new season finds the experts at This Old House in historic Cambridge, Mass., working on a mid-century Modern house for biotech bachelor, George Mabry. At the project house near Harvard Square, host Kevin O'Connor and master carpenter Norm Abram d... (more)iscover that George's house is the sleeper on a street of renovated beauties. Problems include water damage, structural issues, failing plumbing, and an outdated floor plan that locates the master bedroom near the front door. The kitchen, renovated 13 years ago, and many aspects of the landscape, will stay. General contractor Tom Silva shows Kevin the failing 50-year-old tar-and-gravel roof, while plumbing and heating expert Richard Trethewey shows Norm the house's original boiler and early radiant-heat system, both of which are still in use. Despite concerns about working in a congested city neighborhood, the team is up for the challenge, and the change of pace, of working on a Modern home.