Thugs, chases through the streets of San Francisco, scientific discoveries, and other mysteries abound! Matt and Heather Townsend, orphaned when their bioscientist parents are killed in the 1989 Loma Prieta earthquake, become wards of their Great Aunt Estelle. Her stately old house in the Marina District holds intrigue, and a secret. Fortunately, Matt discovers the secret on his thirteenth birthday, and not too soon. He was about to go stark raving mad with boredom. Years earlier and unkekno ...