Because of Mr. van Pels fib where did did people assume the Franks went?

it was actually between Mr van Pels and Otto Frank. Otto left a note with an address in Maastricht on it. This implied that the Franks were headed to Maastricht, which was a common layover point for people getting passage into Switzerland. Mr. van Pels, who did not join the others until the weekend, did his part to encourage that rumor, and it worked perfectly.