Senescence is the final stage of life, where cells can no longer regenerate--the fate that awaits us all when we stop growing and changing. The starship Sanctuary has returned home after twenty years to a strange and hostile world. Stewart is sent as an ambassador to see if Earth still has the capacity to change or whether the crew will let the world suffer the consequences of corporate policies. Billionaire geneticist Laura Zeiss holds his fate in her hands ... and thereby the planet's. Will she choose to become one of the rulers of a decaying world or risk everything to save a naive young man? When Stewart finds out her secrets, will he still want her help?