Assuming the Truth is a Stranger mission in Grand Theft Auto V given to Protagonist Michael De Santa by the infamous Epsilon Program. The location is Grapeseed.
When Michael arrives, he sees Marnie who says that his name is actually Zolag. She goes on telling him about the things she has done, she then goes on to speak about how some actors and musicians are members of the Epsilon Program. She then tells him that the "spirits" will contact him with details. The mission ends once Michael leaves the area.
Michael will then receive an email with a list of five cars he needs to deliver to a house on Hillcrest Ridge Access Rd in Vinewood Hills in order to unlock the next mission:
- Pegassi Vacca
- Benefactor Surano
- Declasse Tornado
- Enus Super Diamond (One way to obtain is for Michael to do the Random Event of rescuing the groom tied to a pole in Great Chaparral on Route 68 near the gun store and clothing store. The vehicle you must drive the groom to the wedding is an Enus Super Diamond.)
- Dinka Double T