3-3.5 for me but I think it'll really appeal to the target audience so it all rounds up.
I really like the premise of this book (a family of cryptid hunters turned cryptid hoaxers has to pull off a huge job with the odds against them) & I greatly enjoyed the crime shenanigans of the two teen protagonists, buuuuuuuut I hated the way the characters & the story itself treated the feelings of it's protagonist. See the emotional drama of the story is that the Youngest McNeil, Grayson, doesn't want to join the family business, he wants to be a photographer instead. He completely tuned out of hoaxing when he tried to merge his passion & his family's livelihood with a class report/photos on the Loch Ness monster (My memories are a bit fuzzy here, but I'm fairly sure he didn't have any pictures of the actual dummy his family uses for fake Nessie sightings) & his Dad torched the whole project with little explanation (Like I get their all dealing with some trauma, but when you're kid is Stoked about something you can't just burn it to the ground & expect there to be no emotional consequences). Almost every person in this book is a general butt about Grayson's feelings & while there is a change of heart towards the end (fine, its a middle grades book, I get it) there is NEVER a reckoning with dad about it. Grayson is the one that has to change for the story to go forward & while that is not unreasonable, it is upsetting to see it when no one tries to understand his side of things really. Blergh! Basically it boils down to what most Mg adventures do for me, I want to gather up all these little abused adventure hooligans, give them a hug, let them feel their feelings, & smack their adults/'caretakers'.
All that said, the premise is fun & interesting (cryptids & crime), the story reads fairly well (a bit slow at the beginning but there's a lot to set up), & the characters are relatable enough (& boys! Why are there so few good boy protag Mg books these days?). I think it'll be a big hit when we get to booktalk at schools again & I mostly enjoyed reading it (despite my desire to strangle most everyone).