Most Popular Books by Dan Greenburg

Ten-year-old Zack gets a chance to meet the old horror film star Count Bugosi, who may or may not be a real vampire.

The Zack Files #28.

The author's memoirs as a skeptic investigating the paranormal and the history of occultism. "This book is the delightful, irreverent, often spooky record of his discoveries."-back flap.

After Zack opens his medicine cabinet one morning and sees a boy who could be his double staring back at him, he enters a parallel universe.

When Cody is 14, he runs away from home, leaving behind his abusive mother, and flees across the country. He doesn’t stop until he hits Texas and the Sam Houston Tiger Ranch. Under the guidance of Sunny, the ranch’s owner, he cares for the animals in ways he never imagined. He feeds them a diet of raw, bloody meat. He cleans out their cages. He takes them for exercise. He finds out how to get a tiger to back down, and when he should back down himself. But there is another lesson Cody has to learn—sometimes people are harder to handle than tigers.

When his friend Spencer, the class genius, spends the night, he and Zack discover how to leave their bodies and travel around New York City, but they have one problem--how to get back inside themselves.

The Zack Files #27.

In Central Park, Zack and his dad encounter an alien who has lost his spaceship, which has been towed because it was illegally parked.

Wally and Cheyenne Shluffmuffin fall back into the clutches of the show-tune happy Hortense Jolly at the Jolly Days Orphanage in this seventh book of the deliciously disturbing Dripping Fang series. Illustrations.

The Zack Files #25.

When Zack goes to a store to buy a baseball card, he finds himself face-to-face with his future son who has traveled back in time.

The Zack Files #29.

A generous North Pole teenager named Santa Claus discovers his calling in life when he borrows his father's sleigh to deliver presents to good children on Christmas Eve.

Zack is forced to share his body with a bossy, British queen who has been dead for almost one hundred years.

Zack learns that the baseball card he wants to buy has just been purchased by a boy named Mack who, when meeting him, surprisingly introduces himself as Zack's son from the future. Simultaneous.

When Zack is bitten by a tick during a class trip to Central Park he succumbs to Rhyme Disease, which causes him to speak only in rhymes and to float like a helium balloon.