Reading order
| # | Title | Published | Author | Buy on Amazon |
|---|---|---|---|---|
| 1 | Unwrapping the Castelli Secret | 2015 | Jackie Ashenden | Buy |
| 2 | Brunetti’s Secret Son (Secret Heirs of Billionaires) / Christmas at the Chatsfield | 2015 | Jackie Ashenden | N/A |
| 3 | Brunetti’s Secret Son/ Christmas at the Chatsfield | 2015 | Jackie Ashenden | Buy |
| 4 | The Secret to Marrying Marchesi | 2016 | Jackie Ashenden | Buy |
| 5 | Demetriou Demands His Child | 2016 | Jackie Ashenden | Buy |
| 6 | The Desert King’s Secret Heir | 2016 | Jackie Ashenden | Buy |
| 7 | The Sheikh’s Secret Son | 2017 | Jackie Ashenden | Buy |
| 8 | The Innocent’s Shameful Secret | 2017 | Jackie Ashenden | Buy |
| 9 | The Greek’s Pleasurable Revenge | 2017 | Jackie Ashenden | Buy |
| 10 | The Secret Kept from the Greek | 2017 | Jackie Ashenden | Buy |
| 11 | Carrying the Spaniard’s Child | 2017 | Jackie Ashenden | Buy |
| 12 | Kidnapped for the Tycoon’s Baby | 2017 | Jackie Ashenden | Buy |
| 13 | The Greek’s Secret Son | 2018 | Jackie Ashenden | Buy |
| 14 | Claiming His Hidden Heir | 2018 | Jackie Ashenden | Buy |
| 15 | The Secret the Italian Claims | 2018 | Jackie Ashenden | Buy |
| 16 | The Heir the Prince Secures | 2018 | Jackie Ashenden | Buy |
| 17 | The Italian’s Unexpected Love-Child | 2018 | Jackie Ashenden | Buy |
| 18 | Wed for His Secret Heir | 2018 | Jackie Ashenden | Buy |
| 19 | The Baby the Billionaire Demands | 2018 | Jackie Ashenden | Buy |
| 20 | Married for His One-Night Heir | 2018 | Jackie Ashenden | Buy |
| 21 | The Secret Kept from the Italian | 2018 | Jackie Ashenden | Buy |
| 22 | Demanding His Secret Son | 2019 | Jackie Ashenden | Buy |
| 23 | Sicilian’s Secret Son | 2019 | Jackie Ashenden | N/A |
| 24 | The Sheikh’s Secret Baby | 2019 | Jackie Ashenden | Buy |
| 25 | Claimed for the Sheikh’s Shock Son | 2019 | Jackie Ashenden | Buy |
| 26 | The Sicilian’s Secret Son | 2019 | Jackie Ashenden | Buy |
| 27 | Demanding His Hidden Heir | 2018 | Jackie Ashenden | Buy |
| 28 | Shock Heir for the King | 2019 | Jackie Ashenden | Buy |
| 29 | The Maid’s Spanish Secret | 2019 | Jackie Ashenden | Buy |
| 30 | Sheikh’s Royal Baby Revelation | 2019 | Jackie Ashenden | Buy |
| 31 | Cinderella’s Scandalous Secret | 2019 | Jackie Ashenden | Buy |
| 32 | Unwrapping the Innocent’s Secret | 2019 | Jackie Ashenden | Buy |
| 33 | Proof of Their One-Night Passion | 2019 | Jackie Ashenden | Buy |
| 34 | The Italian’s Unexpected Baby | 2019 | Jackie Ashenden | Buy |
The Secret Heirs of Billionaires is one of Harlequin Presents’ most extensive multi-author lines, with 34 entries connected through the shared theme of billionaire heroes discovering hidden children. The books span from 2015 to 2019 and feature contributions from numerous romance authors.
Each book stands alone as a complete romance, united by the secret baby/hidden heir premise. The series includes settings across the globe, from Greek islands to Spanish estates, with heroes who must reconcile their powerful lifestyles with unexpected fatherhood.