With the UK National Cyber Security Centre aiming for organisations to complete post-quantum cryptography (PQC) planning by 2028, and Google setting sights for a 2029 PQC migration timeline, the quantum future is no longer theoretical. This talk will bring you on a journey to understanding the mathematics behind today's encryption, how quantum computing threatens it, why data stolen today could be decrypted tomorrow, and how your organisation can start preparing now. With simple graphics and easily digestible concepts, this talk is suitable for all ages and scientific understanding!