Secret of the Willows

"Kendall Morgan traveled to The Willows to be near her relatives, the last people to see her sister Sue Anne alive. What Kendall didn't understand was how her sister, a marvelous swimmer, had died in the shallow pool. Whom could she trust? Everyone seemed to be hiding the truth. Then the Pandora's box of evil flew open - and all the horrors of The Willows descended on young Kendall."