In the book, Arlena had been told to hide in the cave if she sees Mrs. Redfern coming. Arlena sees her, and then she runs and hide. We are also told that she cannot see the beach when she is in the cave, and has to wait there untill Patrick comes.
So, Christine comes down the ladder, Arlena hides, Christine takes on her swimmingsuit and lay down. Arlena is still in the cave since that is what she has been told.
Next, Patrick and Mrs. Gardiner come, see the body. Mrs. Gardiner takes the boat and hurries back.
Christine stands up, takes her clothes on and leaves up the ladder. Now, it is time for Patrick to kill. He goes to the cave where Arlena is still waiting. He kisses her and strangles her. In the book she is very much alive and well when she hides in the cave.
Patrick has bought two identical swimming outfit. One for Arlena, which he asks her to wear that day, and another for his wife.
Christine could not have told anyone about the shower she took, since that would have broken her alibi. According to her, she had no time to take a bath at all.
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