In his continuing quest to earn college recommendation letters from the gods, Percy has to pet sit the goddess Hecate’s polecat and giant mastiff during Halloween week. What could go wrong?

Rick Riordan’s newest Percy Jackson adventure is full of hilarious set pieces, a diverse cast of gods and monsters, and many other delightful tricks and treats.

Percy Jackson, now a high school senior, needs three recommendation letters from the Greek gods in order to get into New Rome University. He earned his first one by retrieving Ganymede’s chalice. Now the goddess Hecate has offered Percy another “opportunity”—all he has to do is pet sit her polecat, Gale, and mastiff, Hecuba, over Halloween week while she is away. Piece of cake, right?

Percy, Annabeth, and Grover settle into Hecate’s seemingly endless mansion and start getting acquainted with the fussy, terrifying animals. The trio has been warned not to touch anything, but while Percy and Annabeth are out at school, Grover can’t resist drinking a strawberry-flavored potion in the laboratory. It turns him into a giant frenzied goat, and after he rampages through the house, damaging everything in sight, and passes out, Gale and Hecuba escape. Now the friends have to find Hecate’s pets and somehow restore the house, all before Hecate gets back on Saturday. It’s going to take luck, demigod wiles, and some old and new friends to hunt down the animals and set things right again.

Featured in “Best Middle Grade Fantasy Books” – Reedsy Discovery

“Fun & Fast Paced, This is Middle Grade Fantasy at its Best!” – ★★★★★ — Amazon Reviewer

“If you know any middle grade readers who enjoy science fiction/fantasy with a mix of action, danger, and humor – recommend this book to them, or just go ahead and give them a copy.” — The Fairview Review

“With elements of adventure, exploration, other worlds, and fantastical science, Nemesis and the Vault of Lost Time is an exciting middle-grade novel with plenty of suspense… Behind the adventure are important messages about believing in oneself and finding inner strength.” — The Children’s Book Review

Thirteen-year-old Max is a daydreamer. It gets him into trouble at school, but his restless curiosity really turns problematic when he runs into a mysterious professor at his uncle’s bookstore. The old man informs Max that time is being sucked out of the planet by invisible bandits, stolen from unsuspecting people one breath and one sneeze at a time, and is being stored in a central vault. Once full, the vault will fuel a hungry horde of invaders looking to cross into earth, and cross out all its people. What’s more, the professor claims he knew Max’s missing scientist father. With the help of his best friends, Derek and Samantha, Max must harness his compulsive curiosity and find passage to this place called Nemesis to stop the sticky-fingered time thieves and halt their planned invasion. But when the professor goes missing and the clock starts ticking, Max discovers far more than he imagined. Just how much Max is willing to sacrifice hinges on the realization of just who or what he is beyond the bounds of time.

“…an exciting, action-packed adventure and I recommend you give it a shot.” ★★★★★ Mark Buxton – Young Adult Books Central

“P.J. Davis weaves a fun middle grade portal fantasy romp through mysterious worlds with lots of action…” ★★★★ Shaun Stevenson – Reedsy Book Review