“I think so, Tip. How’s this? Monkey comes in. No alarm on the skylight, because the magnetic plate under it would be ‘on’ all night and would have caught anybody—anything but a monkey able to jump at a command while it swung clear—or the man above swung it.”
“So far, so good.” Potts waited expectantly.
“The ape wandered around, until it heard a call it recognized from outside, on the street. It was trained to open bolts, and the only other bolt that wouldn’t have a camera equipment and electric plate was our coal chute, that had the Chief stumped how to fix it.”
“And why would he have to go down there?”
“To let in his mate—another beast.”
“And what was it?”
“Well, what could leave a snake trail?”
“A boa-constrictor, or one of them bushmasters out of Australia?”
“What else—out of Australia?”
Potiphar stared, thinking hard.