Sam Samurai (The Time Warp Trio Series #10)

Joe, Sam, and Fred have conquered the summer reading list, Greek monsters and Roman gladiators, but a haiku-writing assignment lands them in what might be their scariest adventure yet! Samurai warriors, really big swords, and three twenty-first century kids are a dangerous combination...unless one of the boys can figure out a way to find the book and get them back home before disaster strikes.