Please help.
Book I read in grade school, 4th grade maybe? Which means this would be 1983, 84.
Sisters go on a camping trip with a group. One of the sisters is smart and responsible, and the other sister is a bit spoiled. Very into her looks. On the trip the spoiled, and I think younger, sister goes missing. As the trip progresses little things at the campsite also start to go missing, including a set of the missing sister’s curlers. The older sister puts the pieces of the puzzle together and realizes her sister is sending her a message with these missing items. Turns out one of their crew kidnapped her and kept her hidden in these ancient Indian caves. The guilty party’s name is Michael Waverly.
Does this sound familiar to anyone?
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Lost Classics of Teen Lit: Name That Book! 