The "EasyMark" system, combined with a serial number, sounds like it could be related to a variety of contexts, but one prominent area where such a system is utilized is in the realm of electronics and software for marking or identifying products, documents, or even assets. However, without a more specific context, I'll craft a narrative that could fit a generic scenario involving an "EasyMark" system and a serial number.
The man who walked in at 4:47 PM was named Curtis. He was young, thirty at most, with the sharp, hungry look of a coyote. But his voice was soft, almost apologetic. easy mark plus serial number