Local author John Poswall has launched a California book tour for his latest novel, The Altar Boys “ a courtroom drama and legal thriller set in Sacramento “ after a celebration and signing at Borders Books in Sacramento Wednesday. Poswall and his son will then travel by van to 15 Borders bookstores in five days, ending in San Diego, where he will undergo treatment at the world-famous Scripps Clinic for his recent onset of leukemia. Cities in the tour include Davis, Vacaville, San Rafael, San Francisco, San Ramon, Palo Alto, San Jose, Monterey, Santa Barbara, Oxnard, Los Angeles and San Diego. Altar Boys is about religion and faith and facing one's own mortality, Poswall said. So, it is appropriate and perhaps ironic that my book tour will end with the issue of my own mortality in question. Poswall, in addition to being the author of two novels, is also a trial lawyer listed in Best Lawyers in America and Superlawyers of Northern California. He is known for his high-profile courtroom victories against some of the biggest corporations in America, including the Catholic Church, he added. The book tour, and subsequent medical treatment, will be covered daily on a blog linked to his Web site, www.johnposwall.com.