Free Surfacing (Spark Saga) by Melissa Dereberry

double meaning, then.  But would we expect anything less from a poet?”
                  Cricket chuckles.  “Not at all.  C’mon.  I have the app loaded.”
                  We pass the phone back and forth, watching the blue dot.  We pass the swings, the pavilions and benches, all the way to the edge of a small lake that contains a forest of cattails.  “Now what?”  I ask.  “It can’t be under water.”
                  “Well, technically, I suppose it could. ”
                  I shake my head.  “No way am I going in there.”
                  “Me either.  Let’s walk a little to the left and right and see if the target gets clearer.”
                  We move left first.  There is a pile of flat rocks along the edge of the water, leading to a small dock.
                  “We’re actually getting closer,” Cricket notes.  “Keep moving.”
                  We step cautiously onto the dock.  It’s a bit worn and discolored, but still sturdy, and we begin looking around for any place where a clue could be hidden, but we find nothing.
                  Cricket sits down with a sigh.  “It’s like we’re right on top of it.  But there’s nothing here.”
                  “Maybe someone moved it.  I’m sure it happens all the time.”
                  “Maybe.  That would suck.  I mean, without this clue, our adventure is pretty much over.”
                  She lies down on her back, her hands behind her head, and closes her eyes.  “The sun feels good,” she says.  Then, she rolls over on her stomach and places her chin on her hands.  She is staring at the water.  Suddenly, she cries out, “Wait a minute!  What’s this?!”  She reaches down near one of the posts and pulls up an old rusty piece of chain.  Sure enough, there is a small black plastic container attached to it.
                  “Waterproof?”  She mumbles, fiddling with the box. After a few failed attempts, she finally opens it and inside is another cylinder, exactly like the other one, with a slip of paper inside.
                  “I’m getting goose bumps again!”  She exclaims.
                  “What does it say?”
                  She reads:  “ Congratulations, you have found the second clue.  The adventure continues.  Hard stone will not contain me, but its timeless message is of grave concern.”  She rolls her eyes.  “Here we go again.  I think this guy enjoys confusing his treasure hunters.”
                  “Ok, a little bit at a time, just like before.  Hard stone.   Go.”
                  “Hmmm.  Rocks, quarry, cliff…”
                  “No, I think this is something very specific.  Think things made out of stone.”
                  “Sidewalk, wall, countertop, statue…”
                  “Let’s move on… maybe there’s a clue within the clue.  …will not contain me .”
                  “That means the stone does not contain the clue.”
                  “Or maybe the person who planted the clue.”
                  “Good thinking.”
                  “ But its timeless message… ”
                  “Leave it to a poet to have a timeless message,” Cricket scoffs.  “Perfect, right?”
                  “ ….is of grave concern. ”
                  “Meaning, it is something very important…”
                  “Or something rather dark and foreboding….”
                  “Maybe both.”
                  “Also, somber or serious…”
                  “Hold the phone!”  Cricket squeals.  “Hard stone and grave!  We are looking for a grave .  Somebody’s