1970’s Nine Princes in Amber is the first volume in Roger Zelazny’s five-part Corwin Cycle, which is part of the ten volume Chronicles of Amber.
Despite amnesia, “Carl Corey” has no problem understanding that he is being overmedicated or that if his minders have someone’s best interests at heart, it’s not his. The patient bullies his way out of the medical facility in which he has been immured, blackmailing the staff into providing him with funds and information.
Destination one: the home of Corey’s alleged sister Evelyn Flaumel. Since she has been footing the bills for his treatment, perhaps she can provide more information.