The hilarious, action-packed adventures continue in Finlay Donovan Crosses the Line, the sixth book in Elle Cosimano's New York Times bestselling Finlay Donovan series. Blending laugh-out-loud humor, amateur sleuthing, mystery, and rom-com charm, this beloved series is perfect for readers who love witty heroines and fast-paced twists.

Life has never been simple for mystery novelist and accidental amateur sleuth Finlay Donovan—but this time, it's personal.

When her best friend, nanny, and partner-in-crime Vero is extradited to Maryland to face criminal charges for a theft she insists she didn't commit, Finlay refuses to stand by and watch her take the fall. Confined to an ankle monitor while awaiting trial and receiving increasingly threatening messages demanding missing money, Vero desperately needs someone to uncover the truth.

Armed with determination, questionable plans, and her signature knack for finding trouble, Finlay heads to Maryland to investigate. As the two friends race to uncover the real thief, dodge danger, and untangle long-buried secrets, they'll discover that clearing Vero's name may be their most dangerous mission yet.

Packed with laugh-out-loud moments, lovable characters, and nonstop twists, Finlay Donovan Crosses the Line delivers another wildly entertaining mystery that fans won't want to miss.

Why You'll Love Finlay Donovan Crosses the Line

• Finlay Donovan Book 6
• New York Times bestselling series
• Mystery with romantic comedy
• Fast-paced and laugh-out-loud funny
• Clever amateur sleuth adventure
• Strong female friendship
• Twisty, binge-worthy storytelling
• TV series in development for Peacock

Tropes & Themes

• Amateur sleuth
• Best friends
• Accidental crime-solving
• Found family
• Single mom heroine
• Mystery with humor
• Partner in crime
• Whodunit
• Women's fiction
• Romantic comedy elements

Perfect For Fans Of

• Janet Evanovich
• Christina Lauren
• Ali Hazelwood
• Jesse Q. Sutanto
• Richard Osman
• Dial A for Aunties
• Stephanie Plum series
• Funny cozy mysteries

Book Details

Title: Finlay Donovan Crosses the Line

Series: Finlay Donovan

Book Number: Book 6

Author: Elle Cosimano

Format: Hardcover

Genre:

• Mystery
• Cozy Mystery
• Romantic Comedy
• Contemporary Fiction

Pages:
368

Publication Date:
March 17, 2026

Dimensions:
8.43 × 5.75 × 1.27 inches

Series Reading Order

1. Finlay Donovan Is Killing It
2. Finlay Donovan Knocks 'Em Dead
3. Finlay Donovan Jumps the Gun
4. Finlay Donovan Rolls the Dice
5. Finlay Donovan Digs Her Own Grave
6. Finlay Donovan Crosses the Line

About the Author

Elle Cosimano is a New York Times and USA Today bestselling author, International Thriller Writers Award winner, and Edgar Award nominee. Her wildly popular Finlay Donovan series has earned widespread acclaim for its perfect blend of mystery, humor, and romance, and is currently being adapted into a television series for Peacock by Tina Fey and Lang Fisher.