Helen Keller and her teacher went on vacation to Brewster, Cape Cod to spend time with Mrs. Hopkins. When Helen first approached the sea, she excitedly went into the water but got frightened after getting struck on a rock and almost drowning. After recovering, she enjoyed feeling the waves against rocks. Later, Miss Sullivan showed Helen a horseshoe crab that fascinated her so much she carried it home, but it disappeared the next day when she realized her mistake in removing it from the habitat.