A Ghost Named Fred - An I Can Read Mystery (Nathanial Benchley, Ben Shecter, 1968)

Here's A Ghost Named Fred (1968, written by Nathanial Benchley, illustrated by Ben Shecter), a slightly spooky but mostly cute story about a lonely boy, George, who, while playing astronaut by himself (hence the space helmet) wanders into an old mansion haunted by friendly ghost Fred and a bat named Charlie. Selected scans below.