The cause of the explosion at the Oak Grove Marina near Edgewater, Maryland, is unknown.

CNN: Six children injured in Maryland boat explosion

Another Seattle hotel looking to capitalize on the book is The Edgewater.

CNN: Hotels offer 'Fifty Shades of Grey' sexy weekend getaways

She checked into a room at the Edgewater Beach Hotel where he was staying and invited him to her room.

NPR: Obsessed Fan Who Shot Player, Inspired Movie, Dies