[Complete at 9k words] Dr. Phillip Shirley has dedicated his work to ParaSymbio: genetically engineered parasites used as an alternative treatment for leukemia. However, when a mutation reverts the parasites to how nature intended, Phillip and his wife Brenda become trapped at Phillip's place of work, cornered by coworkers now controlled by the once friendly symbionts. If Phillip and Brenda want to escape unscathed, Phillip must face the very things he created.