The Attack of the Aqua Apes is the 3rd book in the Ghosts of Fear Street series.
Synopsis[]
The ghosts of Fear Street-- they'll haunt you forever! Do you believe in ghosts? Don't say no until you take a walk down Fear Street. Pat the woods-- where no birds sing. Past the lake-- where something lurks beneath the water. Past the cemetery-- where everyone is dying to meet you.
And be sure to say hello to Scott and Glen. They decided to use water from the Fear Street lake to grow their Aqua Apes. The creatures started out tiny and cute. But one kept growing, and growing, and growing... And its teeth kept getting sharper, and sharper, and sharper...