The Titanic has attracted more writing than almost any other single event of the last century, most of it recycling the same handful of images. On a Sea of Glass belongs to the other tradition, the researched, source-led account that returns to survivor testimony and works forward from the evidence.
Tad Fitch is one of the co-authors of that account, and the scale of the finished work reflects the method. Thirty-two hours is not a length you reach by retelling a familiar story. It is the length of a book that stops to weigh conflicting witnesses and explain why one version has been preferred to another. Our catalogue happens to file it on the travel shelf, but its natural home is maritime history.