A collection of unrelated one-shots exploring various 'what if' scenarios. #18: What if… Castle didn't come clean about Johanna Beckett's murder at the end of 1x10?

One-shot based on the end scene in 3x21: Dead Pool when Beckett tells Castle that from now on she's a one-writer girl. COMPLETE

An Au moment set during an Embarrassment of Bitches s4. For mobazan27.

Of all the pages he'd ever penned, of all the words he'd ever written, these anonymous letters to an ink and paper woman—all shadow and mystery and fragile allure—might prove more extraordinary than anything that came before. AU

Finding another living, breathing human being in the post-apocalyptic world was not just difficult, but impossible. Kate Beckett never expected to find anyone, let alone Richard Castle. After saving him from certain death, they form an alliance, which soon leads to the realization from both of them that they finally found a reason to keep living. Caskett AU/ZombieApocolypse

'We're just friends.' 'Friends who kiss.' Kate tells herself it will never happen again, but she couldn't be more wrong. A late season two AU.

This can't be the end; this just cannot be it. AU for episode 3x17, 'Countdown.'

Set on S3 "Countdown". Meeting AU. Beckett is running to stop a dirty bomb from going off and wiping NYC from the map, but a car crash will change her life forever. Co-written with @StacyRodgers / Our entry for Castle Winter Hiatus Ficathon 2015 @CastleFicathon #CastleFicathon

"What is she thinking? Uprooting her life, leaving the only town she's ever called home, and, even worse, dragging her father along because she's too selfish to leave him behind. But the new job should excite her. And it does. Secret Service Agent? It's a leap she never thought she'd take." Based on a prompt from the castlefanficprompts tumblr.

'Martha is right. This really can't wait another day, wall be damned...' Castle and Beckett get a nudge in the right direction, courtesy of his mother. An AU Cops and Robbers ending in honor of Castle FanFic Monday.

"I now pronounce us husband and wife," Castle mutters at her ear, waggling both his eyebrows and his hand to display a matching wedding band. Just like that, she's Kate Rodgers, newly wedded and undercover in the Wild West. (7x07 before Castle and Beckett became Caskett. Season Two AU.)

"Castle, Castle wake up." Their joined hands wiggle against her belly in her efforts to rouse him. "Castle, we got married last night," she hisses. - A Season 4 AU that starts mid-4x08 (Heartbreak Hotel) based on a tumblr prompt. Caskett.

Just when Kate feels her life is hitting rock bottom, fate throws her right in the middle of Downtown Manhattan, on that fateful September 11, 2001. Underneath the rubble of her life, and her city, will Kate be to find hope, peace and love? AU **HIATUS**

If it only takes a moment for your life to change forever, can a 'one time thing' right the wrong? An AU Caskett meeting.

Nearly three years have passed since Sherlock jumped, and now he comes home to finish what he started. He wants to finish with John by his side. But that may not be as simple as he first thought.

What if Elizabeth had a special talent that made her feel even more apt at forming opinions about people? What if even this special gift couldn't help her figure out the mysterious Darcy? Modern P&P with supernatural twist.

It rains and it pours and he can think of nothing but Lizzy Bennet and the handprint she left on his heart. A story about loss, love, rain, and how the three changed William Darcy.

CASKETT. Post-"The Blue Butterfly". Beckett reveals something about her tattoo. Castle wants to know more.