The Billionaires' Club series by Raylin Marks consists of 9 books, published between 2020 and 2025. The series begins with Dr. Mitchell.
The Billionaires' Club Holiday series by Raylin Marks consists of 1 book, starting in 2024. The series begins with The Holidays with Dr. Mitchell.
The Immortal Devotion series by Raylin Marks consists of 4 books, published between 2018 and 2019. The series begins with Life Blood.
The The Delights of Devils series by Raylin Marks consists of 3 books, published between 2024 and 2025. The series begins with The Billionaire Gamemaker.