Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Fascinating and thorough research with a twist

In the preface of this remarkable book, the two joint authors agree to disagree about an astonishing hypothesis - that the "Titanic" which sank in 1912 was in fact the sister ship "Olympic", switched for sinister reasons. A far fetched notion, but certainly worth considering in the light of recent evidence. The book also contains a thorough analysis of the two Boards of Inquiry, and reconsiders the case against Captain Lord in great detail. A provisional passenger list is imcluded, and copious footnotes and references make this an essential book for those who thought that James Cameron's film told the full story