Tombquest Valley of the Kings by Michael Northrop (2015)

The tombs are opening ...Nothing can save Alex Sennefer's life. That's what all the doctors say, but his mother knows it's not sure. She knows that the Lost Spells of the Egyptian Book of the Dead can pull her son back from the brink. The problem? When she uses the spells, five Death Walkers are also brought back to life. An ancient evil has been unleashed. Long-dead mummies are awakening. New York City is overrun by menacing scorpions. And worst of all for Alex, his mum and the Lost Spells have both disappeared. He and his best friend, Ren, will do anything to find his mum and save the world ...even if they have to go head-to-head with a Death Walker who has been plotting his revenge for 3000 years. Some tombs were meant to stay closed...