Stephen Marlowe 
My Shipmate — Columbus [PDF ebook] 

In this rollicking alternate-history romp, a college student picks a classroom fight about the traditional account of Christopher Columbus’s "discovery" of America. At first, he doesn’t have any facts with which to shore up his hunch. But soon, through a bizarre turn of events, Danny is able to gain first-hand knowledge of the role Columbus played — and it differs significantly from the version that has been passed down in history books.