When Petronella Morton puts an ad in the local newspaper for aMONSTERaSITTING AFTER SCHOOL AND WEEKEND:S,a little does she know that her phone will begin to ringa AND RING AND RING AND RING Nelly soon discovers that there are families of monsters living secretly all over the Montelimar Estate Whether itas trying to keep Slop the Squurm entertained, walking the Grerksa pedigree gog, Glug, or solving a bank robbery with the help of three little Water Greeps, Nellyas always got her hands full Join her at three different addresses, for three monstrously different monster-sitting adventures