Two can keep a secret

Echo Ridge. A charming town, though descended from the handout. Town, where now have to live the high school student Ellery and her twin brother. The town in which occurred a series of mysterious incidents...
Recently on one of the streets of the city was to death brought down the teacher at the local school — the culprit fled the scene of the accident. Fifteen years ago — ruthlessly murdered school beauty Queen, a graduate of Lacey... And a few years earlier from Echo ridge disappeared Sarah — aunt Ellery.
Can all these cases be connected? Ellery and her classmate Malcolm decide to understand.
Every day they are getting closer to the truth, but what price they will have to pay for it?