Hiram and Sibyl Eisenberg have fallen head over heels in love with Leif and Laura Wrightson. Leif and Laura return all the same passion for Sibyl and Hiram, yet all four remain committed to their spouses. What to do? The year is 1971, the place is California, and what never before seemed possible is suddenly irresistible. Camping on the shores of Fallen Lake in the high Sierra, one night they begin a new direction in their lives and those of their children, turning two marriages into one.   Laird Harrison is a novelist and multimedia journalist. His recent novel, Fallen Lake tells the story of a powerful attraction between two couples and how it affected their children. Currently a freelance correspondent for Reuters news service, Harrison has written for magazines (TIME, Audubon, Reader’s Digest, People, Health), newspapers (San Francisco Chronicle, Chicago Tribune, Detroit Free Press); and Web sites (Salon, MSNBC, CNN.com, KQED). He has produced video for Web sites including Smithsonianmag.com and audio for WUNC radio. Much of his writing focuses on health or on social movements. Harrison has taught writing at San Francisco State University, UC Berkeley Extension and Mediabistro. He grew up in Berkeley, California, and studied creative writing and politics at the University of California, Santa Cruz. He lives in Oakland, California.