Reviews
"One of the twistiest time-tales I've ever read! An amazing story of love, murder, betrayal, multiple universes, dinosaurs – and just what 'causality' really means" —Diana Gabaldon
"While my head is still spinning trying to understand the complexities of time travel and quantum mechanics, I absolutely loved this book... I highly recommend you add this book to your list, no matter your interests. This is a thrill ride that makes you think and you won’t be able to put it down!" —San Francisco Book Review
"Crichtonesque thrillers don't come much better than this intricate outing which combines a fantastic premise – a time-travel device known as Absolom is used to imprison dangerous criminals in the prehistoric past – with a closed-circle whodunit... Riddle keeps the twists coming, including a mind-bending jaw-dropper that sets up the book's second half. By creating sympathetic and complex characters, the author makes suspending disbelief easy. Readers won't be able to turn the pages fast enough" —Publishers Weekly Starred Review
"The book picks up like a great roller coaster. With a nod to John Varley's Millennium, the thrills in this mystery are not so much about who the killer is but how to save lives while maintaining their timeline" Booklist
'Thoroughly gripping... Come for the time travel, stay for the plot twists.' Kirkus
"A riveting saga of a time travel novel that author A. G. Riddle has penned with impressive originality, expert storytelling skills, and an inherent fascination that will hold a very special appeal for science fiction fans." —Midwest Book Review
"We're talking high-concept thriller here... there are many japes and high jinks ahead" The Times
"Are we talking plot twists? More like spirals. Gripping, clever, mind-bending stuff" Daily Mail