Secret Heirs of Billionaires books in order

Secret Heirs of Billionaires is a massive Harlequin romance series featuring thirty-two books about wealthy men discovering they have hidden children, with Dani Collins among multiple contributing authors.

Reading order

# Title Published Author Buy on Amazon
1 Unwrapping the Castelli Secret 2015 Dani Collins Buy
2 Brunetti’s Secret Son/ Christmas at the Chatsfield 2015 Dani Collins Buy
3 The Secret to Marrying Marchesi 2016 Dani Collins Buy
4 Demetriou Demands His Child 2016 Dani Collins Buy
5 The Desert King’s Secret Heir 2016 Dani Collins Buy
6 The Sheikh’s Secret Son 2017 Dani Collins Buy
7 The Innocent’s Shameful Secret 2017 Dani Collins Buy
8 The Greek’s Pleasurable Revenge 2017 Dani Collins Buy
9 The Secret Kept from the Greek 2017 Dani Collins Buy
10 Carrying the Spaniard’s Child 2017 Dani Collins Buy
11 Kidnapped for the Tycoon’s Baby 2017 Dani Collins Buy
12 The Greek’s Secret Son 2018 Dani Collins Buy
13 The Baby the Billionaire Demands 2018 Dani Collins Buy
14 Claiming His Hidden Heir 2018 Dani Collins Buy
15 Demanding His Hidden Heir 2018 Dani Collins Buy
16 The Secret the Italian Claims 2018 Dani Collins Buy
17 Wed for His Secret Heir 2018 Dani Collins Buy
18 The Heir the Prince Secures 2018 Dani Collins Buy
19 The Italian’s Unexpected Love-Child 2018 Dani Collins Buy
20 Married for His One-Night Heir 2018 Dani Collins Buy
21 The Secret Kept from the Italian 2018 Dani Collins Buy
22 Demanding His Secret Son 2019 Dani Collins Buy
23 The Sheikh’s Secret Baby 2019 Dani Collins Buy
24 The Sicilian’s Secret Son 2019 Dani Collins Buy
25 Claimed for the Sheikh’s Shock Son 2019 Dani Collins Buy
26 Shock Heir for the King 2019 Dani Collins Buy
27 The Maid’s Spanish Secret 2019 Dani Collins Buy
28 Sheikh’s Royal Baby Revelation 2019 Dani Collins Buy
29 Cinderella’s Scandalous Secret 2019 Dani Collins Buy
30 Unwrapping the Innocent’s Secret 2019 Dani Collins Buy
31 Proof of Their One-Night Passion 2019 Dani Collins Buy
32 The Italian’s Unexpected Baby 2019 Dani Collins Buy

Secret Heirs of Billionaires is one of Harlequin’s longest-running continuity series, with thirty-two books published between 2015 and 2019. The shared premise — wealthy men discovering they have secret children — provides the framework, while individual authors bring their own characters and settings. Greek, Italian, Spanish, and Middle Eastern billionaires all discover hidden heirs across the collection.

Dani Collins is one of many authors who contributed to this series. The books work as standalone romances within the shared concept, each featuring a different billionaire and a different secret child revelation.

Frequently Asked Questions

How many books are in the Secret Heirs of Billionaires series?

There are 32 books in the Secret Heirs of Billionaires series, published between 2015 and 2019.

What is the first book in the Secret Heirs of Billionaires series?

The first book in the Secret Heirs of Billionaires series is Unwrapping the Castelli Secret, published in 2015.

Why are there so many Secret Heirs of Billionaires books?

“Secret Heirs of Billionaires is a multi-author Harlequin continuity series — a shared premise (billionaires discovering secret children) explored by many different romance authors. The thirty-two books published between 2015 and 2019 each feature a different billionaire learning he has an heir he didn’t know about, with Dani Collins as one of the contributing authors.”

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