The titles, covers, and summaries for Adventures #21, A Treacherous Tide (https://www.amazon.com/Treacherous-Tide-Hardy-Boys-Adventures/dp/1534441379/ref=as_li_ss_tl?linkCode=ll1&tag=hardboyscasee-20&linkId=c8090c6abb09d74a1b36b10f29752d05&language=en_US), which has a release date for June 23, 2020 and Clue Book #12, Sea Life Secrets (https://www.amazon.com/Life-Secrets-Hardy-Boys-Clue/dp/1534442588/ref=as_li_ss_tl?linkCode=ll1&tag=hardboyscasee-20&linkId=7df52e36bd40b57e935847beb14f97f2&language=en_US), which has an August 11, 2020, release date, are both now starting to show up at various online retailers for pre-order.
(https://www.hardyboyscasefiles.com/images/comingsoon/HBA_021.jpg) (https://www.amazon.com/Treacherous-Tide-Hardy-Boys-Adventures/dp/1534441379/ref=as_li_ss_tl?linkCode=ll1&tag=hardboyscasee-20&linkId=c8090c6abb09d74a1b36b10f29752d05&language=en_US) (https://www.hardyboyscasefiles.com/images/comingsoon/CB012.jpg) (https://www.amazon.com/Life-Secrets-Hardy-Boys-Clue/dp/1534442588/ref=as_li_ss_tl?linkCode=ll1&tag=hardboyscasee-20&linkId=7df52e36bd40b57e935847beb14f97f2&language=en_US)