In November 1968 Däniken was arrested for fraud, after falsifying hotel records and credit references in order to take out loans[7] for $130,000 over a period of twelve years. He used the money for foreign travel to research his book.[5] Two years later,[7] Däniken was convicted for "repeated and sustained" embezzlement, fraud and forgery, with the court ruling that the writer had been living a "playboy" lifestyle.[12] He unsuccessfully entered a plea of nullity, on the grounds that his intentions were not malicious and that the credit institutions were at fault for failing adequately to research his references,[5][7][12] and on 13 February 1970 he was sentenced to three and a half years imprisonment and was also fined 3,000 francs.[7][13] He served one year of this sentence before being released.[5][14]
His first book, Chariots of the Gods?, had been published by the time of his trial, and its sales allowed him to repay his debts and leave the hotel business. Däniken wrote his second book, Gods from Outer Space, while in prison.[5][12]