Head Games, (the Hector Lassiter Series) by Craig McDonald Black House Books, PB, 2007, $14.95, 300 pages, ISBN #978-0-615-44110-8 Memorial day weekend is by tradition the start of summer, and the beginning of vacation season.  It’s when we look forward to ice cream, baseball and garage sales . . . as well as “lazy hazy days,” halter tops, short shorts, sandals and flowers blooming for three months or more.